皮皮学，免费搜题
登录
搜题
【简答题】
试比较钩藤、羚羊角、天麻三药功效、主治病证的共同点与不同点。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】Alternator
【简答题】alternator
【简答题】革兰氏染色结果G-为 G+为紫色。
【单选题】An alternator switchboard has a synchroscope and synchronizing lamps, if the synchroscope is broken, which of the steps listed is the most essential before an alternator can be paralleled with the bus...
A.
The breaker should be closed when one synchronizing lamp is dark and the other is bright
B.
The breaker should be closed when both synchronizing lamps are bright
C.
The frequency meter should be used to determine that the incoming alternator frequency is slightly higher than the bus
D.
A portable phase sequence indicator must be used to verify the information from the lamps
【单选题】What is the purpose of the alternator reverse power trip?
A.
To pr the alternator from “motoring” by being supplied power from other parallel alternator
B.
To pr parallel operation if the excitation field voltage is reversed
C.
To pr the alternator from being paralleled if it is out of phase with the main switchboard
D.
To give automatic disconnection of the circuit breaker when you are taking the alternator off the switchboard
相关题目：