问题
单项选择题
在机械零件的各摩擦副中，它无论在何种摩擦过程中及何种摩擦速度下，也无论接触压力大小和是否存在润滑情况下都会发生（），它是最广泛的一种磨损形态。
A、疲劳磨损
B、氧化磨损
C、磨料磨损
D、粘着磨损
答案
参考答案：B
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在机械零件的各摩擦副中，它无论在何种摩擦过程中及何种摩擦速度下，也无论接触压力大小和是否存在润滑情况下都会发生（），它是最广泛的一种磨损形态。
A、疲劳磨损
B、氧化磨损
C、磨料磨损
D、粘着磨损
参考答案：B
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| Once a Frenchman 1 in England. He didn't know English very well. One day he went to the post office with a postcard. He bought a 2 . Then he gave the stamp and the postcard to the girl 3 the desk. "Oh, no," the girl said, "you must stick (贴) the stamp on yourself." He was very 4 . He couldn't believe his ears. "Why must I stick the stamp on 5 ?" 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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