绕接电缆芯线时必须使用(),不得以手钳代替。
参考答案:绕线枪
The news ________ exciting and we feel very happy. [ ]
A. are
B. have
C. is
D. has
数控车床的()通常设在主轴端面与轴线的相交点。
A、机床参考点
B、机床坐标原点
C、工件坐系零点
D、换刀点