![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[主观题]
20/5t桥式起重机的主电路包含()、过电流继电器等
A.电源开关QS
B.交流接触器KM1-KM4
C.凸轮控制器SA1-SA3
D.电阻器1R-5R
E.电动机M1-M5
F.电磁制动器YB1-YB6
暂无答案
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.电源开关QS
B.交流接触器KM1-KM4
C.凸轮控制器SA1-SA3
D.电阻器1R-5R
E.电动机M1-M5
F.电磁制动器YB1-YB6
A.QD20/5-19.5A5
B.QE20/5-19.5A5
C.QS20/5-19.5A5
D.QS20/5-A5-19.5