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【单选题】
下述关于使用便携式兆欧表测定交流电动机定子线圈对地绝缘的方法,叙述正确的是_______。1测量绝缘电阻时,应根据设备额定工作电压的大小选用合适等级的兆欧表; 2测量前对兆欧表进行一次开路和短路实验,检查仪表是否良好; 3测定对地绝缘时,可以在通电运行兆欧表的E接线柱接到交流电动机导电良好的外壳上,L接线柱接到定子线圈的接线端子上;4摇动兆欧表至额定转速,指针稳定后所指刻度值为此线圈的匝间绝缘电阻值。A.
②③
B.
①②
C.
②④
D.
①④
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举一反三
【单选题】What CANNOT Daniel do?
A.
Calendar calculation .
B.
Read a long numerical sequence and then recite it .
C.
Read a long numerical sequence and then recite it backward s.
D.
Recite the endless Pl sequence backwards in prope r order.
【简答题】Conversation 1
【简答题】Conversation 1
【单选题】What CANNOT Daniel do?
A.
Calendar calculation.
B.
Read a long numerical sequence and then recite it.
C.
Read a long numerical sequence and then recite it backwards
D.
Recite the endless Pi sequence backwards in proper order.
【简答题】Conversation 1
【单选题】What cannot Daniel do?
A.
Recite the endless Pi sequence backwards in proper order.
B.
Calendar calculation.
C.
Read a long numerical sequece and then recite it backwards.
D.
Read a long numerical sequence and recite it.
【简答题】Conversation 1
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