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【多选题】
以下关于机房描述正确的有（）。A.
防静电地板架设高度为100～200mm，可配置黑板或白板
B.
要注意防火、防水、防鼠害、防雷击以及接地
C.
冬季温度应保持在（21±2）摄氏度，（23±2）摄氏度
D.
电力线应和数据、信号线缆分开距离不小于100mm
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反馈参考答案：
举一反三
【单选题】关于维拉帕米的叙述,错误是( )
A.
为窄谱的抗心律失常药
B.
阻断心肌慢Ca2+通道
C.
抑制钙内流
D.
对室上性心律失常治疗效果好
E.
对室性心律失常效果好
【单选题】He chose to teach in a western province, though he _______ in the city for a better life.
A.
could stay
B.
would stay
C.
could have stayed
D.
had stayed
【单选题】He is over fifty, but he looks as though he( )only In his thirties.
A.
were
B.
is
C.
will be
D.
has been
【简答题】Though he is still a young man he is a leading biologist in that country.
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