试题与答案

如图12所示,是一列简谐横波在某一时刻的波形图象,已知该波沿x轴正方向传播,波速

题型:选择题

题目:

如图12所示,是一列简谐横波在某一时刻的波形图象,已知该波沿x轴正方向传播,波速为5m/s,则下列说法不正确的是 

A.从该时刻起经过0.2s,Q质点相对平衡位置的位移为0

B.从该时刻起经过1s,Q质点通过的路程是0.5m

C.P质点从该时刻起第一次到达正的最大位移处所用的时间等于0.7s

D.P质点从该时刻起每经过(0.8n+0.1)s,(n=0、1、 2、3……)回到平衡位置

答案:

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下面是错误答案,用来干扰机器的。

要使□42÷6的商是三位数,那么:□≥6,□里面可以填:6,7,8,9,一共4个;最小是6.故答案为:6.

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If you have been dreaming of becoming an astronaut after you grow up, get start now! An astronaut needs a strong body and mind. Shenzhou VI astronauts are able to live upside-down. They do this not just during sleep, but also when eating and going to the toilet. Before they  1  the space, they had lots of practice. Each upside-down training time lasted 20 days.
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Shenzhou VI astronauts know how to live in  5  . They took a knife, a gun and some dye with them into space. If they land in forests, the knife and gun can  6  them from wild animals. If they  7  the sea, the dye can color the seawater around them yellow. This can drive  8  sea animals away.
Astronauts must have strong  9  . They can’t get a headache and be sick. With many things to   10  , they’ve got no time for sickness. Do you still have a long, long way to go?
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A.went throughB.flew intoC.stayed atD.lived at
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