卡尺研磨器一般制成()形
A、正方
B、长方
C、圆
D、三角
参考答案:C
Hearing the news, he rushed out, the book on the table and disappointed into the distance.
A.leaving; lying open
B.left; lay opened
C.left; lain open
D.leaving; lie opened
耐压试验,高压开关本体应能承受()KV,开关总体组装后,应能承受()KV(工频)1分钟,无击穿闪弧现象。