Positive displacement, helical gear pumps are well suited for pumping oil because （）

A . a variable displacement axial piston pump B . a constant displacement axial piston pump C . a reciprocating piston pump D . a centrifugal pum

A . changing the angle of the tilting plate B . changing the speed of the pump C . moving the slide block and rotor D . moving the shaft trunnion block

A . 在AD中天津Hel进入Pre-windows 2000 compatibleaccess组 B . 使用EAP在Hel和客户端访问，使用EAP在Sales组远程访问策略 C . 为所有Sales组成员选择store password susing reversible encryption D . 为所有Sales组成员配置用户委派信任关系

A、regulating the ratio between torque and speed via the torque limiter at the motor B、directing the motor output flow through a bypass line C、maintaining a constant flow and pressure input D、controlling the input flow rate

A . equal B . larger C . smaller D . equivalent

A . KG is minimum B . angle of inclination is a maximum C . small-angle stability applies D . KM is a minimum

A . area times the stroke B . area times the stroke, times the number of cylinders C . volume times the stroke D . volume times the stroke, times the number of cylinder

A．在AD中天津Hel进入Pre-windows 2000 compatibleaccess组 B．使用EAP在Hel和客户端访问，使用EAP在Sales组远程访问策略 C．为所有Sales组成员选择store password susing reversible encryption D．为所有Sales组成员配置用户委派信任关系

The United States is well-known for its 【C1】______ of major higher highways designed to help a 【C2】______ get from one place to another in the shortest possible time. 【C3】______ these wide modern roads are generally 【C4】______ and well maintained, with much sharp curves and many straight 【C5】______ , a direct route is not always the most 【C6】______ one. Large 【C7】______ often pass by scenic areas and interesting small towns. Furthermore, these highways generally 【C8】______ large urban centers, which means that they become crowded with 【C9】______ traffic during rush hours, 【C10】______ the " fast, direct" route becomes a very slow route. However, there is still always another route to take 【C11】______ you are not in a hurry. Not far from the 【C12】______ new" superhighways", there are often older, 【C13】______ heavily traveled roads which go through the countryside. All of these are good two-lane roads; others are uneven roads 【C14】______ through the country. These secondary routes may 【C15】______ steep slopes, along high 【C16】______ , or down frightening hillsides to towns 【C17】______ in deep valleys. Through these less direct routes, longer and slower, they generally go to places 【C18】______ the air is clean and the scenery is beautiful, and the driver may have a 【C19】______ to get a fresh, clean 【C20】______ of the world. 【C1】 A．network B．equipment C．facilities D．way

Thinking Human emotion is one of those factors that cannot he definedexactly. The reason is that it is quite uncertain. We cannot change thefeelings that are roused when we experience different things. (26)Some people forget that they arc in control. They make their choicesbased on their emotions. I hey experience failure and loss and let theiremotions rule their decisions. They are trapped in their sadness and thus. experience more failure. Some people say they need a lucky break to recover from 、theirfailures. (27) They need to get over their failures on their own. But how do they dothat？ I he answer is: positive thinking. People often fail to realize the power of positive thinking. (28 )Theyfail to realize that they only need to overcome their fears in order to trulysucceed in life. They just have too much pride and are blinded of theirown shortcomings. The power of positive thinking lies in belief. (29)You make thedecisions that affect your life. You may not be able to change yourenvironment, but you are able to change the way you react to it. The power of positive thinking lies beyond false courage. You need lotake another look at the world around you. (30)You can&39;t rest on yoursuccess. or foolish pride will cause you to make wrong decisions. They fail to realize that their worst enemy lies within themselves. However. we must always remember that we can control ourreactions. You can’t just take a look at your failures, or you will lose hope. D. We can benefit a lot from positive thinking. E.However, life rarely gives people a break. F.You need to believe that you arc in control. 26________ 27 28 29 30

A、仪表举止端庄、落落大方behaving decently B、衣着整洁、大方neatly dressed C、保持愉快、自信的工作心态confident smile D、非工作日可穿休闲衫、短裤、凉鞋进入客户现场wearing casual shirt, shorts, sandals in the customer’s office 此题为多项选择题。

A．cargo weight．货物重量 B．light ship weight．空船重量 C．bunkers燃料 D．all of the abov E．以上所有

A．Grooming may cause an enemy or predator to be confused. B．Grooming is a convenient and accessible behavior. C．Grooming often occurs before eating and drinking. D．Grooming is a common social activity. 此题为多项选择题。

A:Fundamental power factor; B:The ratio of the effective value of the fundamental current to the effective value of the total current; C:Phase difference between fundamental current and voltage; D:Active power / inspecting power