Based on a DR，at approximately 1817 you would expect to（）.

A . plane tangent at one point B . cylinder tangent at one parallel C . cone tangent at one parallel D . series of cones tangent at selected parallel

A . The Query Only property is set to Yes.  B . The Conceal Data property is set to Yes.  C . The Insert Allowed property is set to Yes.  D . The Update Allowed property is set to Yes.

A .  Layer 2 mode B .  Layer 3 Edge mode C .  Layer 3 Central mode D .  Layer 3 In-Band mode

A . mean low water B . mean lower low water C . mean high water D . mean high water spring

A . Mercator projection B . polyconic projection C . orthographic projection D . gnomonic projectio

A . alter course to port B . maintain course and speed C . alter course to starboard D . maintain course and reduce speed

A . plane tangent at one point B . cylinder tangent at the equator C . cone tangent at one parallel D . infinite series of cones tangent at selected parallel

A . You are to the left of your track line B . Your fathometer reads about 265 fathoms C . You are in a cable area D . You are governed by the Inland Rule

A . 正确 B . 错误

"Homemakers go out of their way to save pennies at the store and then don't realize that waste of edible (可食用的) foods adds up much more at home," said Dr. Rathji. He was one of about 100 food experts who met in Boise for a conference on food waste and ways to prevent it. American families throw out between 8% and 20% of edible food at a cost of $4.5 billion per year. That's almost as much as the federal government spends every year for food stamps and child nutrition programs. He found that food items which are costly and in short supply tend to be wasted more. During the 1973 meat shortage, meat waste increased to 9%, compared with 3% in 1974 and 1975. Sugar and sugar products waste jumped to 19% in 1975, when sugar prices doubled from the previous year. Dr. Rathji theorizes that high prices force consumers to experiment, sometimes buy in large quantities. In the case of meat, sometimes low-priced cuts for unappetizing varieties are purchased, consumers then tend to waste more. His theory is that the more variety in food bought, the more wasted. Regular bread is wasted at about a 10% rate, but specialty breads and rolls are wasted at a 20% rate. If people are eating the same thing every day, they learn how to manage it. But if you're trying to pull something out of the cookbook every night, that's bound to be some waste. Another finding is that lower income families waste less food than middle and upper income families. And the study found that dog food, which accounts for 8% of a shopping cart, is rarely wasted. Fresh produce and frozen items are more likely to be wasted. The study also showed people with the most knowledge of safe, edible food waste the least. Much food is tossed out because a homemaker suspects it is spoiled when it is not. 1、Large quantities of food are thrown out because a homemaker____. A、thinks they are not delicious B、 says they taste bitter and hot C、thinks they smell bad D、 suspects they are spoiled when they are not 2、American families throw out between____of edible food every year. A、5%～8% B、 8%～10% C、 20%～28% D、8%～20% 3、When sugar prices doubled, waste of sugar____. A、went down B、went up C、stayed the same D、was cut in half 4、Which of the following statements is true？____ A、American housewives are not good homemakers. B、Upper-income families are more wasteful than lower-income ones. C、American families throw away almost as much food as they consume. D、Americans waste a great deal of dog food. 5、When do American families waste more food？____ A、When prices are high. B、When food is scarce. C、When they think it is spoiled. D、All of the above.

Coinage is a process of inventing words based on existing morphemes.()

<img src='https://img2.soutiyun.com/ask/uploadfile/2019-03-27/3ce23df98edd74223603f0cf62587cff.jpg' /> A．A B．B C．C D．D

是 否

A.enter a traffic separation zone B.cross a submerged pipeline C.depart a regulated area D.depart a restricted area

During the hours when you labor through your work you may say that you’re “hot”. That’s true. The time of day when you feel most energetic is when your cycle of body temperature is at its peak. For some people the peak comes during the afternoon. For others it comes in the afternoon or evening. No one has discovered why this is so, but it leads to such familiar monologues (自言自语) as: “Get up, John! You’ll be late for work again!” The possible explanation to the trouble is that John is at his temperature-and-energy peak in the evening. Much family quarrelling ends when husbands and wives realize what these energy cycles mean, and which cycle each member of the family has. You can’t change your energy cycle, but you can learn to make your life fit it better. Habit can help, Dr. Kleitman believes. Maybe you’re sleepy in the evening but feel you must stay up late anyway. Counteract (对抗) your cycle to some extent by habitually staying up later than you want to. If our energy is low in the morning but you have an important job to do early in the day, rise before your usual hour. This won’t change your cycle, but you’ll get up steam (鼓起干劲) and work better at your low point. Get off to a slow start which saves your energy. Get up with a leisurely yawn and stretch. Sit on the edge of the bed a minute before putting your feet on the floor. Avoid the troublesome search for clean clothes by laying them out the night before. Whenever possible, do routine work in the afternoon and save tasks requiring more energy or concentration for your sharper hours. 第31题：If a person finds getting up early a problem, most probably ________. A) he is a lazy person B) he refuses to follow his own energy cycle C) he is not sure when his energy is low D) he is at his peak in the afternoon or evening

A．Revealed preference analysis implies that Pedro only prefers basket B to basket A if basket A is more expensive B．Pedro prefers market basket B to basket A C．Market basket B will cost more than basket A D．If the prices change and Pedro chooses market basket C,which now costs the same as basket B,then basket C is prefer to basket A．

A．$1,469.31. B．$1,500.00. C．$1,489.57.

要求：假设你是张华，得知你的一位朋友王海沉迷于网络游戏