Cathy said she speak four languages.[ ]
A. may
B. could
C. would
D. can
答案:B
短QT综合征唯一有效的治疗方法为()
A.基因治疗
B.抗心律失常药物治疗
C.导管射频消融
D.置入心脏复律除颤器
E.手术治疗
滚动轴承过热变色是指轴承工作温度超过了()℃。
A.80
B.100
C.170