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【单选题】
零件安装在车床三爪卡盘上车(内车刀安装在刀架上)。加工后发现被加工出现外大里小的锥度误差。产生该误差的可能原因有( )。A.
主轴径向跳动
B.
三爪装夹面与主轴回转轴线不同轴
C.
车床纵向导轨与主轴回转轴线不平行
D.
刚性不足
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皮皮学刷刷变学霸
举一反三
【单选题】When he turned professional at the age of 11，Mike________to become a world champion by his coach and parents.
A.
expected
B.
was expecting
C.
was expected
D.
would he expected
【单选题】When he turned professional at the age of 11, Mike _________to become a world champion by his coach and parents. [ ]
A.
expected
B.
was expecting
C.
was expected
D.
would be expected
【单选题】1mol的两种气体He和O2,在温度相同时,下列说法正确的是:
A.
两种气体分子的自由度相等；
B.
两种气体的体积相同；
C.
两种气体的内能相同；
D.
以上均不正确。
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