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【简答题】
当上极限尺寸等于公称尺寸时,其 差等于零; 当零件的实际(组成)要素等于其公称尺寸时,其 偏差等于零。
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【单选题】To look more closely______this situation, I spent two weeks there.
A.
about
B.
up
C.
for
D.
at
【简答题】听力原文： My wife and I spent two weeks in London last year. We went there in the autumn. We think it is the best season to visit England. The weather is usually good and there aren't too many tourists in...
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