乙炔大压机采用什么方式防止压机超速的?
参考答案:
三选二超速保护器。该保护器有三组速度信号输入,当检测到有两组或两组以上的速度信号超过设定值时,输出一个开关信号联锁压机停车
—How about shopping with us tomorrow?
—I’d love to, I have to prepare for the coming exam.
A.go; and
B.go; but
C.going; but
D.going; and
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