Completemaintenanceofelectricalmotorsshouldincludeperiodicchecksformachine（）
A. vibration
B. watertightintegrity
C. speeddroop
D. reactivepower
查看答案
ThenumberofcyclespersecondoccurringinACvoltageisknownasthe（）
A. phaseangle
B. frequency
C. waveform
D. halfmode
下面哪些是会议文书（）
A. 日程安排表
B. 开幕词
C. 代表提案
D. 主题报告
E. 选举结果
F. 群众来信
Voltagewillalwaysleadcurrentina/an（）
A. capacitivecircuit
B. inductivecircuit
C. magneticcircuit
D. resistivecircuit
YouareattemptingtoparalleltwoACgeneratorsandthesynchroscopepointerisrevolvingintheslowdirectionThisindicatesthatthefrequencyoftheincomingmachineis（）.
A. higherthanthebusfrequency
B. lowerthanthebusfreouencv
C. thesameasthebusfrequencybutoutofphasewithit
D. thesameasthebusfrequency,andthecircuitbreakermaybeclosedatanypointerposition
微信支付 
支付宝支付