采用洁净的()清洁电磁制动器动静衔铁表面杂物。
A、棉布
B、毛刷
C、钢丝刷
D、铲刀
参考答案:A
()是确定水泵安装高度的主要参数。
People had been conscious of the problem before, but the new book made them aware of its______.
A.multitude
B.magnitude
C.altitude
D.latitude