题目内容

The main reason why the video game will be played online is that

A. the unition of new technology and current economics．
B. the increase of the users．
C. the change on living styles．
D. the need of video game itself．

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通常镗刀旋转为(),镗刀或工件的移动为()。

A. 进给运动主运动
B. 主运动进给运动
C. 进给运动进给运动
D. 主运动主运动

钻床的主参数是()。

A. 最大钻孔直径
B. 最大工件长度
C. 主轴内孔直径
D. 主轴转速

某双代号网络计划中(以天为时间单位)，工作k的最早开始时间为6，工作持续时间为4；工作M的最迟完成时间为22，工作持续时间为10；工作N的最迟完成时间为20，工作持续时间为5。己知工作k只有M、N两项紧后工作，工作k的总时差为()天。

A. 2
B. 3
C. 5
D. 6