一座共两层的集贸市场发生火灾,若楼梯已被烧断,顶楼人员不能选择()作为逃生工具。
A.落水管
B.避雷网(线)
C.带电电线
D.房屋向外突出部分
参考答案:C
John's success has nothing to do with good luck. It is years of hard work ________ has made
him what he is today.[ ]
A.why
B.when
C.which
D.that
用于治疗心绞痛、高血压病和肺动脉高压症的药物是:
A.氟桂嗪
B.地尔硫卓
C.维拉帕米
D.硝苯地平
E.晋尼拉明