问题
单项选择题
用图示U形水银测压计测A点压强，已知h=500mm，h=300mm，则A点的相对压强为（）N／m2。
A.6500
B.63700
C.35084
D.1960
答案
参考答案：B
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用图示U形水银测压计测A点压强，已知h=500mm，h=300mm，则A点的相对压强为（）N／m2。
A.6500
B.63700
C.35084
D.1960
参考答案：B
Once a Frenchman 36___ in England. He didn’t know English very well. One day he went to the post office with a postcard. He bought a 37 . Then he gave the stamp and the postcard to the girl 38 the desk. “Oh, no,” the girl said, “ you must stick（贴）the stamp on yourself.” He was very 39 . He couldn’t believe his ears. “Why must I stick the stamp on 40 ?” he asked. “Oh,” said the girl, “I mean that you must stick the stamp on the postcard. And you must do it yourself.”
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