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【单选题】
在切削用量三要素中,影响切削力的主要因素是( )
A.
Vc
B.
f
C.
ap
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【判断题】The Venusian scientists will probably come to the conclusion that there is no life on Earth.
A.
正确
B.
错误
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【单选题】Once he realizes that it is his mistake, Jim never ________ to admit and correct it.
A.
hesitates
B.
doubted
C.
hesitated
【简答题】影响招聘的外部因素主要有哪些?
【单选题】There isn't _______ tea in your cup. Would you like ________? [     ]
A.
some; some
B.
some; any
C.
any; some
D.
any; any
【判断题】晶体管的电流放大系数β越大越好。 ( )
A.
正确
B.
错误
【简答题】倒向晶体管的电流放大系数为什么小于正向晶体管的电流放大系数?
【单选题】His friends and doctors very much ________ whether he could do it.
A.
doubted
B.
doubtful
C.
undoubtedly
【简答题】设总体 的密度函数为 ,则 ____(填“是”与“不是”) 的无偏估计.