起重机发生火灾的原因主要是由于电气设备在运行中超过额定负荷，发生线路短路、过热或打火花造成的。（）
1、正确正确
暂无解析
WhichofthefollowingtypesofquestionsisNOTincludedintheGrammar-TranslationMethod?
Thiscarisveryexpensive.Youhavetopayhalfamilliondollars________it.
WithanappropriaterelativepronounMybrotherspeaksEnglishfluently,________Idon’t.
ltisoursincerehopethatyouwilldirectyourefforts__thepromotionofthisnewproductinyourmarket__ourmutualbenefit.
Ourpaymentterms(付款方式)are___,irrevocableletterofcreditforthefullinvoicevalue.()
