变压器空载合闸励磁涌流大小与波形与下列因素无关的:()
A.电源电压大小和合闸初相角
B.系统阻抗大小
C.变压器剩磁大小和方向
D.母线接线类型
参考答案:D
男,57岁,平日心悸怔忡,神疲乏力,今晨突然心胸剧痛,四肢厥冷,冷汗淋漓,面色苍白,呼吸微弱,唇舌青紫,脉微欲绝,属()。
A.心阳虚证
B.寒凝心脉证
C.心气虚证
D.瘀阻心脉证
E.心阳虚脱证
They stayed with me three weeks,______ they drank all the wine I had. [ ]
A. which
B. which time
C. during which time
D. during which