【简答题】10Kv变配电设备或线路过电流保护的动作电流是按躲开被保护设备(包括线路)的()工作电流来整定的,并配以动作时限。
【判断题】优先编码器74148的输入端 取值为001111111时,输出 的值为111。
【单选题】Thirst for Oil Worldwide every day, we devour the energy equivalent of about 200 million barrels of oil. Most of the energy on Earth comes from the Sun. In fact enough energy from the Sun hits the pla...
A.
Most of the energy on Earth comes from the Sun.
B.
Oil supply is increasing all the time.
C.
Demand for oil is increasing all the time.
D.
Oil supply is decreasing.
【判断题】仓储可以通过优化包装来提高增值服务。( )
【单选题】定时限过电流保护装置一次侧动作电流值按躲开线路中可能出现的( )来确定。
【单选题】变压器定时限过电流保护的动作电流按躲过变压器()电流来整定。