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【判断题】
减小主偏角可减小已加工表面残留面积高度，从而降低表面粗糙度。A.
正确
B.
错误
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举一反三
【单选题】It was ordered that all the soldiers ____ to the front．
A.
should send
B.
must be sent
C.
be sent
D.
must go
【单选题】It was the order that all the soldiers ________to the front.
A.
should send
B.
must be sent
C.
be sent
D.
must go
【单选题】— _____ the soldiers are very tired, ______ they keep on working. — They are great. We must learn from them. [ ]
A.
Because; /
B.
Though; /
C.
Because; so
D.
Though; but
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