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【单选题】
在第II公差组检验组中,极限偏差仅能用于( )级精度。A.
4~6
B.
1~3
C.
10~12
D.
7~9
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A.
defies
B.
magnifies
C.
mediates
D.
evokes
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A.
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B.
栅比为铅条宽度与其高度之比
C.
栅比为铅条高度与其宽度之比
D.
栅比为单位距离内铅条的数目
E.
栅比表示单位体积中铅的重量大小
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【简答题】Put the verbs in brackets into the c orre c t tense. 1 . We _________ (do) our homework at6.30p.m.yesterday. 2 . They ________ (m ee t) while they _________( study) at university. 3 . l _______ (not l...
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