Neglecting friction，you desire to lift a 300 kgs weight with a stress on the hauling part of 100 kgs.Which of the following tackles would you use（）.

A . 摩擦和磨损； B . 磨损和摩擦

A . acids B . additives C . heat D . gear

A . 正确 B . 错误

A . Oil-lubricated bearings B . Lignum vitae C . Hard rubber D . Bronze bushing

A . A、0.2 B . B、0.4 C . C、0.6 D . D、0.8

A . Bends in the piping B . Slowing the pumping rate C . Pipeline valves D . Backing rings for pipe weld

A . specific gravity B . viscosity C . S E number D . hydrolytic stability

A . acidity of the oil B . pour point of the oil C . flash point of the oil D . viscosity of the oil

A . the lifting appliance can always lift the freight within its rated load B . attention should be paid in order not to break the wedge when lifting cargo C . sometimes the lifting work needs other assistance other than the lifting appliance D . lifting work should be done with every part fit, tightness or adhesio

A . react with insufficient speed droop B . fail to react to small speed changes C . have excessive sensitivity to small speed changes D . remain in the neutral positio

A . reduce B . rise C . raise D . fall

A . Gun tackle B . Luff tackle C . Toe-fold tackle D . Double-luff tackle

A . is always less than 100% B . is always more than 100% C . is always equal to 90% D . is always less than 90%

A．concepts B．tricks C．benefits D．techniques

M: ...and be boxed in by a thousand other houses I suppose~ Surrounded by a thousand faceless neighbors. No, let' s go for the village. After all I'm the one who has to do all the traveling. Back and forth to London every day. And I would rather add a 15 minutes bus ride to the train ride than be--How does it go？--cabin' d, cribb' d confi' d. F: That' s all very well...all very well to take that romantic attitude. You know... you think you can get out of everything...wriggle out of any argument...by quoting Shakespeare. What about my preferences？ You are being selfish you know. M: Selfish？ Me？ F: Yes. Think of the children. Its seems to me that you are so carried away with the idea that your personal likes and dislikes are making you anything but practical. What's the relations between the speakers？ A．Friends. B．Colleagues. C．Husband and wife. D．Landlord and tenant.

A．un hombre joven mujeriego B．no tiene moral, no teme a nada C．se mueve entre la vida y la muerte,le importa el aquí y ahora D．finalmente somete a la justicia de Dios pero no a la de los hombres 此题为多项选择题。

A．Parte de su obra trata temas morales y religiosos B．Fue amigo de Luis De Góngora al que dedicó varios sonetos de halago C．Mezcló jerga y cultismos en sus poemas para provocar contrastes jocosos D．Está dentro de la corrientr conceptista

A A false sense of security B Remote destinations C Too risky for some D Holidays that don't quite work E New findings F Very little real danger G Too much routine H Second-hand experiences I Available to all Activity Holidays Whether it's bungee-jumping, climbing or sky-diving, we want to test ourselves on holiday. Peter Jones tries to find out why. Risk-taking for pleasure is on the increase. Adventure activities and "extreme" sports are becoming very popular and attracting everyone from the young and fit to people who, until recently, were more likely to prefer walking round museums at weekends. Grandmothers are white-water rafting, secretaries are bungee-jumping, and accountants are climbing cliffs. 【B1】__________ Well-planned summer expeditions to tropical locations are now fashionable for European university students. As they wander over ancient rocks or canoe past tiny villages, away from it all, it ]s quite possible to feel "in tune with nature", a real explorer or adventurer. 【B2】__________ A whole blanch of the travel industry is now developing around controlled risks. Ordinary trippers, too, are met off a plane, strapped into rafts or boats and are given the sort of adventure that they will remember for years. They pay their money and they trust their guides, and the wetter' they get the better. Later, they buy the photograph of themselves "risking all in the wild". 【B3】__________ But why the fashion for taking risks, real or simulated？ The point that most people make ix that city lie is tame, with little variety, and increasingly corrtroled. Physical exercise is usually restricted to aerobics in the gym on a Thursday, and a game of football or tennis in the park or a short walk at the weekend. 【B4】__________ Says Trish Malcolm, an independent tour operator: "People want a sense of immediate achievement and the social element of shared physical experience is also important.' Other operators say that people find the usual type of breaks-such as a week on the beach-Loo slow. They say that participation in risk sports is a reflection of the restlessness in people. They are always on the go in their lives and want to keep up the momentum on holiday. 【B5】__________ But psychologists think it's even deeper than this. Culturally, we are being separated from the physical, outside world. Recent research suggests that the average person spends less and less time out of doors per day. 【B6】__________ Nature and the great outdoors are mostly encountered through wildlife films or cinema, or seen rushing past the windows of a fast car. In a society where people are continually invited to watch rather than to participate, a two-hour ride down a wild and fast- flowing river can be incredibly exciting. 【B7】__________ One psychologist believes that it is all part of our need to corrtrol nature. Because we have developed the technology to make unsinkable boats, boots that can stop us getting frostbite or rackets that allow us to survive in extreme temperatures, we are beginning to believe that nothing will harm us and that we are protected from nature. That is until nature shows us her true power in the form. of a storm, flood or avalanche. 【B1】______

You are developing a Windows Communication Foundation (WCF) service. The following code defines and implements the service. (Line numbers are included for reference only.)01 [ServiceContract(SessionMode = SessionMode.Allowed)]02 public interface ICatchAll03 {04 [OperationContract(IsOneWay = false, Action = &quot;*&quot;, ReplyAction = &quot;*&quot;)]05 Message ProcessMessage(Message message);06 }0708 public class CatchAllService : ICatchAll09 {10 public Message ProcessMessage(Message message)11 {1213 ...14 return returnMsg;15 }16 }You need to ensure that two identical copies of the received message are created in the service.Which code segment should you insert at line 12？（） A.<img src='https://img2.soutiyun.com/ask/uploadfile/2019-02-04/fab6269351e4a04ee0a851d5f96dd506.jpg' /> B.<img src='https://img2.soutiyun.com/ask/uploadfile/2019-02-04/98c2a291de971b52b6b11f0f31a030d2.jpg' /> C.<img src='https://img2.soutiyun.com/ask/uploadfile/2019-02-04/d546143d78ff2c6f1aed7463f1a53f65.jpg' /> D.<img src='https://img2.soutiyun.com/ask/uploadfile/2019-02-04/ce013fc7da98b989aab41a9ab89c550d.jpg' />

The researchers studied the behaviour of female brown capuchin monkeys. They look cute. They are good-natured, co-operative creatures, and they share their food tardily. Above all, like their female human counterparts, they tend to pay much closer attention to the value of "goods and services" than males. Such characteristics make them perfect candidates for Dr. Brosnan's and Dr. Dewaal's study. The researchers spent two years teaching their monkeys to exchange tokens for food. Normally, the monkeys were happy enough to exchange pieces of rock for slices of eucumber. However, when two monkeys were placed in sepa rate but adjoining chambers, so that each could observe what the other was getting in return for its rock, their became markedly different. In the world of capuchins grapes are luxury goods (and much preferable to cucumbers). So when one monkey was handed a grape in exchange for her token, the second was reluctant to hand hers over for a mere piece of cucumber. And if one received a grape without having to provide her token in exchange at all, the other either tossed her own token at the researcher or out of the chamber, or refused to; accept the slice of cu cumber indeed, the mere presence of a grape in the other chamber (without an actual monkey to eat it) was enough to reduce resentment in a female capuchin. The researches suggest that capuchin monkeys, like humans, are guided by social emotions. In the wild, they are a co-operative, groupliving species. Such co-operation is likely to be stable only when each animal feels it is not being cheated. Feelings of righteous indignation, it seems, are not the preserve of people alone. Refusing a lesser reward completely makes these feelings abundantly clear to other members of the group. However, whether such a sense of fairness evolved independently in capuchins and humans, or whether it stems form. the common ancestor that the species had 35 million years ago, is, as yet, an unanswered question. In the opening paragraph, the author introduces his topic by______ A．posing a contrast. B．justifying an assumption. C．making a comparison. D．explaining a phenomenon.

是 否