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【单选题】
轴类零件在V形架上定位铣轴上键槽时,其定位基准是( )A.
工件外圆柱面
B.
工件轴心线
C.
V形架
D.
V形架对称面
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A.
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B.
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C.
It is normal in Congo that overturn incidents often occur.
D.
The boat accident was mainly because of the severe weather.
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A.
There was a suicide bombing.
B.
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C.
The humanitarian conditions were worsening.
D.
Palestinian economy was boosting.
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