题目内容
Compared with “how are you?”, “how do you do”is more formally used.
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An Englishinvitation with a specific time and place may be regarded as a genuine one, otherwise it may be a greeting.
On the whole, the Chinesecompliment each other quite often and the English-speaking people are rather cautious about using compliments.
光电测距仪的视线应避免（）
视距测量是用望远镜内视距丝装置，根据几何光学原理同时测定两点间的（）的方 法。
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