如图示，试述组合继电器中保护继电器在发动机起动后的控制原理。
参考答案：
发动机起动后，由于交流发电机电压升高，中性点电压也随之升高，当达到规定值时。在磁化线圈L2的电磁力作用下，K2打开，充电指示灯因其电路被断开而熄恶意，同时又将L1电路切断，K1开路，保位线圈3断电，使起动机电磁开关释放，切断主电路，起动机自动停止工作，此时，误将点火开关拧至起动档，起动机也不会工作。
| 用方框中所给单饲的适当形式完成短文。 | |
from February l2th to 28th , 2010. A young girl 2._____Zhou Yang of 3._____ 1500 meters short-track speed(短道速滑)skating team 4._____part in the Olympics. It 5._____her first winter Olympic experience. But she 6._____the gold medal in 1500 meters short-track；speed skating on February 20. People is made 7._____Zhou Yang by her wonderful performance on the international stage in recent years, winning the silver(银)and bronze(铜)medals in the2008 and 2009 world championships respectively. In the past two seasons, she 8._____the top seat in world rankings for the women's 1500 short track. Zhou Yang who 9._____in 1991, comes from Changchun. When she 10._____ after the match, she was very excited ,and she hoped she would provide better lit for her parents,because her mother isn't very healthy. Let's wish her better future! |