A chemical works____ built there.
A.is to being
B.have been
C.were to
D.has been
答案:D
油动机反馈油口的形状主要有哪几种?
如果选用心得安药物作为甲状腺功能亢进手术前准备,下列哪项应慎用或不用()
A.哮喘
B.重度房室传导阻滞
C.低血压
D.心功能差
E.以上皆是