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问题 单项选择题

船舶风动力转船力矩系数与风舷角有关，一般情况下：（）.

A.当风舷角为0°、90°或180°时，风动力矩系数接近于零

B.当风舷角为0°、90°或180°时，风动力矩系数达到最大值

C.当风舷角为45°或135°附近时，风动力矩系数接近于零

D.当风舷角为15°或165°附近时，风动力矩系数达到最大值

答案

参考答案：A

阅读理解

阅读短文，判断正误，正确的写“T”，错误的写“F”。

My name is Daisy. I live with my mother and father in a flat. The flat is on the fifth floor of a tall building. There are 14 floors and a parking garage(车库) in the basement(地下室). My father parks his car there.

Our flat is not in the center of the city. It is 2 miles from the center. My father works in the city, so he goes to work by train every day. He doesn't drive his car. He uses his car only on weekends. Then he takes us into the country or to the beach.

Our flat has three bedrooms. There is a bedroom for my mother and father,one for me and one for my brother. There is a living room, a kitchen and a bathroom. We do not have a garden, but there is a small balcony. There are some plants on the balcony. In summer we often sit out on the balcony because it gets very hot inside the flat. Our flat is small, but we are very happy in it.

小题1: Daisy's flat is on the fifteenth floor.

小题2: Their flat isn't in the middle of the city.

小题3:Daisy's father goes to work by car every day.

小题4:In summer they like sitting out on the balcony because they like staying outside.

小题5:Their flat isn't big, but they live happily in it.
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单项选择题

乌头类药物中毒主要成分

A．虫蛀
B．霉变
C．酸败
D．挥发
E．沉淀
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