机房发生火灾时,在消防器材准备好之前,不要过早打开(),防止火势迅速蔓延。
A、电灯
B、门窗
C、熔断器
D、地线
参考答案:B
The old men who gave away lots of money _____ highly of at yesterday's meeting. [ ]
A. spoke
B. spoken
C. was spoken
D. were spoken
消心痛()
A.扩张静脉,增加冠脉血流
B.减少心肌氧耗量
C.解除冠脉痉挛
D.抗血小板聚积
E.抑制钠离子通道