问题
单项选择题
液体流动时分子间因摩擦而产生阻力的大小，用（）表示。
A.惯性
B.压力
C.压强
D.粘度
答案
参考答案：D
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液体流动时分子间因摩擦而产生阻力的大小，用（）表示。
A.惯性
B.压力
C.压强
D.粘度
参考答案：D
Do you know anything about the moon? The moon is __1____than the earth（地球）, but the sun is ___2___ bigger than the earth. The moon is __3__ from the earth. It’s 380 000 kilometres away. On the earth we see that the moon __4___like a cake. There is _ 5____air on the moon, ___6___there is no living things there. The side of the moon towards（朝，向）the sun is very hot, while the other side is very __7____. People can jump__8__ on the moon than on the earth and walk more __9___there. It takes more than three days to get to the moon __10___spaceship（宇宙飞船）.
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