当混凝土结构施工质量不符合要求时,经()检测鉴定达到设计要求的检验批,应予以验收。
A.有资质的检测单位
B.建设单位
C.监理单位
D.设计单位
参考答案:A
When evacuating a seaman by helicopter lift,which course should the ship take?()
A.Downwind so that the apparent wind is close to nil
B.A course that will keep a free flow of air,clear of smoke,over the hoist area
C.A course that will have the hoist area in the lee of the superstructure
D.With the wind dead ahead because the helicopter is more maneuverable when going into the wind
中性点直接接地系统和中性点不接地系统的短路各有什么特点?