FOCKE401小盒透明纸包装机当拉线拉不动或驱动电机运转慢时，张力臂处于最顶端，触发光电开关造成停机显示“拉线断裂”故障。
参考答案：错
Measures have been taken________ crime in the city. [ ]
A. reducing
B. reduced
C. to reduce
D. of reducing
用砂芯来形成铸件的内部与外部形状的造型方法，称为（）。
A.活砂造型
B.骨架模造型
C.组芯造型
D.劈模造型
