在向继电保护通入交流工频试验电源前，必须首先将继电保护装置交流回路中的接地点断开，除试验电源本身允许有一个接地点之外， 在整个试验回路中不允许有第二个接地点
1、正确正确
暂无解析
His_____andunwillingnesstolearnfromotherspreventhimfrombeinganeffectivememberoftheteam
Youmustberesponsibleforallthelosses____fromyourdelayinopeningthecoveringL/C.
Thepoorgirlhadmuchtoohigh_______ofherowncharmstosuspectthattheCountcouldbeunfaithfultothem
Thoughshe_____andpleaded,herefusedtogotothedance.
Comparedwiththe_____periodlastyear,averagetemperatureshavebeenlow.
