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【多选题】
铣床铣削震动很大产生的原因是（）。
A.
主轴松动
B.
工作台松动
C.
工作台丝杆、螺母间隙大
D.
主电动机震动大
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【单选题】T形槽铣刀铣削时由于（），故应选用较小的铣削用量。
A.
排屑困难，铣刀强度较低
B.
同时铣削直角沟槽及槽底
C.
铣刀转动转快
D.
工件形状较复杂
【单选题】The Grand Canyon Standing on the rim of the Grand Canyon(大峡谷), gazing across this giant wound in the Earth’’s suce, a visitor might assume that the canyon had been caused by some ancient convulsion...
A.
it was caused by some ancient convulsion
B.
its presence is an embarrassment to the state of Colorado
C.
it looks like an injury on the Earth’s suce
D.
it has caused many visitors to injure themselves
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【单选题】T形槽铣刀铣削时由于（），故应选用较小的铣削用量。
A.
排屑困难，铣刀强度较低
B.
同时铣削直角沟槽及槽底
C.
铣刀转动转快
D.
工件形状较复杂
【单选题】The Grand Canyon Standing on the rim of the Grand Canyon(大峡谷), gazing across this giant wound in the Earth’’s suce, a visitor might assume that the canyon had been caused by some ancient convulsion...
A.
it was caused by some ancient convulsion
B.
its presence is an embarrassment to the state of Colorado
C.
it looks like an injury on the Earth’s suce
D.
it has caused many visitors to injure themselves
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