自我评价的运用可体现在以下几个方面()。 ["家长评价问卷","建立幼儿发展档案","对照计划进行评价","教师自我评价问卷"]
发电机的发电量是由()控制。 ["定子的励磁电流","转子的励磁电流","调节器中整流二极管的通断","双金属片的发热量"]
电力通信网采用了哪些新技术?
Cold weather starting of a diesel engine may be made easier by() ["decreasing the compression ratio","using a special fuel having a high ignition temperature","increasing the starting air supply","heating the jacket water"]
配电自动化终端的作用是什么?
空压机起动前为什么要打开卸荷阀及放空阀?