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问题 单项选择题

风速和风压力中心纵向位置对单锚泊船的偏荡周期的影响为：（）.

A.风速增大、风压力中心纵向位置前移，偏荡周期减小

B.风速增大、风压力中心纵向位置后移，偏荡周期减小

C.风速增大、风压力中心纵向位置前移，偏荡周期增大

D.风速增大、风压力中心纵向位置后移，偏荡周期增大

答案

参考答案：A

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小题1:.My best friend in my class is very sad, because her mother is badly ill. I want to help her, but I don’t know what to do.
小题2:I always think about many things before going to bed, so I can’t fall asleep. I feel very sleepy and tired during the day time.
小题3:I like one of the boys in my class. I think I have fallen in love with him. I’m afraid of that my parents and teachers know my secret.
小题4: I want to decorate my room and make it more beautiful and comfortable,but I don’t want to spend too much money on it.
小题5:I bought a pair of sports shoes which cost me 1000 yuan. My grandfather knew this and he was very angry with me, because I spent too much money on the shoes.
A．Don’t fight with him any more. You need to calm down and solve the problem with the teachers’ help.
B．First of all , you have to know that you aren’t old enough to know what real love is. Try to be an ordinary friend with him. You should pay more attention to your school work.
C．Old man had a hard time in the past, so they don’t waste anything in daily life. You should understand your grandfather first. Then you may say sorry to him and don’t waste money any more.
D．If you can’t sleep at night, you’d better relax before going to bed. You may listen to some soft music or read something for fun. Don’t drink tea before you go to bed.
E．You can buy some cheap but beautiful cloth to cover the wall or old furniture. Put up photos you like instead of those expensive ones. Finally, keep your room clean and tidy all the time.
F．You could help her look after her mother and tell her the trouble is nothing, because all of her classmates will give her a hand as long as she needs.
G．You’d better find a chance to talk with them and tell them what you think. I believe they will understand you.
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选择题
下列关于磁感线的说法，正确的是（　　）

A．磁感线从磁体的N极出发，终止于磁体的S极

B．磁感线可以形象地表示磁场的方向和强弱

C．电流磁场的磁感线都是同心圆

D．放入螺线管内的小磁针的N极指向与该处磁感线方向相反
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