确定数控机床坐标系统运动关系的原则是假定()。
A、刀具相对静止的工件而运动
B、工件相对静止的刀具而运动
C、刀具、工件都运动
D、刀具、工件都不运动
参考答案:B
2004年,所有无线广播自办节目中,新闻节目和专题节目所占比例分别为:()
A.13.36%,21.78%
B.37.81%,34.59%
C.37.81%,21.78%
D.13.36%,34.59%
It is very important that enough money ()to fund the project.
A.be collected
B.must be collected
C.is collected
D.can be collected