问题
单项选择题
为了保证压力表测压的准确性，在压力表安装前必须（）
A、按标准压力校对；
B、与实际压力校对；
C、按一般压力校对；
D、按大气压力校对。
答案
参考答案：A
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为了保证压力表测压的准确性，在压力表安装前必须（）
A、按标准压力校对；
B、与实际压力校对；
C、按一般压力校对；
D、按大气压力校对。
参考答案：A
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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