10KV及以下電力變壓器及電抗器的交流耐壓試驗周期為（）。
A、1——3年B
暫無解析
Willallthose_____theproposalraisetheirhands?
Betweenthetwopartsoftheconcertisaninterval,__________theaudiencecanbuyice-cream.
Anearlytypewriterproducedlettersquicklyandneatly;thetypist,_____couldn'tseehisworkonhismachine.
Incalculatingthedailycalorierequirementsforanindividual,variationsinbodysize,physicalactivity,andageshouldbetakenintoaccount.
Thefirstpaperwasmadefromthebarkofthemulberrytree.
