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二维刀具路径有 面铣削 加工、 外形铣削 加工、 ————加工、钻孔 加工
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举一反三
【单选题】In the second paragraph, the author seems to consider the Allied bombing on Germany
A.
imprudent.
B.
immoral.
C.
justified.
D.
reckless.
【简答题】如果圆锥的底面周长是20π，侧面展开后所得的扇形的圆心角为120°．则圆锥的母线是______．
【单选题】All the countries allied to fight against their ______ .
A.
inventor
B.
likeability
C.
mediator
D.
adversary
【单选题】The Allied advantage in the air gradually increased thereafter and became ______ when the United States entered the war in 1917.
A.
preoccupying
B.
embarrassing
C.
overwhelming
D.
counseling
【单选题】Several rounds of air and ground attacks from the allied force left the whole city ______.
A.
in pieces
B.
in ruins
C.
in part
D.
in place
【简答题】已知圆锥的底面周长是10π，其侧面展开后所得扇形的圆心角为90°，则该圆锥的母线长是______．
【简答题】已知圆锥的底面周长是10π，其侧面展开后所得扇形的圆心角为90°，则该圆锥的母线长是 ．
【简答题】如果圆锥的底面周长是20π，侧面展开后所得的扇形的圆心角为120°，则圆锥的母线是（ ）。
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