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【单选题】
内齿轮齿形的加工方法是()A.
滚齿
B.
插齿
C.
剃齿
D.
磨齿
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皮皮学刷刷变学霸
举一反三
【单选题】At the airport, I could hear nothing except the roar of aircraft engines which all other sounds.
A.
diminished
B.
drowned
C.
dwarfed
D.
devastated
【单选题】Often he _________ sit for hours doing nothing at all when he was in low spirits.A．shouldB．would
A.
23. Often he _________ sit for hours doing nothing at all when he was in low spirits. A．should
B.
would
C.
might
D.
Could
【单选题】Often he______ sit for hours doing nothing at all when he was in low spirits.
A.
should
B.
would
C.
could
D.
might
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