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【单选题】
关于紧急求助按钮说法正确的是()A.
它是一个能简单、便捷地进行求助的终端设施
B.
家中安装紧急求助按钮越多越好
C.
家居紧急按与控制主机只能采用有限的方式连接
D.
紧急按钮要安装在隐蔽且不易触摸到的地方
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【简答题】平屋顶的排水坡度如何形成?简述各种方法的优缺点。
【简答题】物质A按一级不可逆反应在一间歇反应器中分解，在67℃ 时转化50％ 需要30min，而在80 ℃时达到同样的转化率仅需20秒，该反应的活化能为（）
【单选题】选出与本句意思一致的选项 Learning humanities was secure repetition in China, but it was shaky originality here. (Para.5)
A.
If one learned humanities in China, one felt safe because it was all about repeating what had been taught. However, if one learned humanities here in the U.S., one would be shaking all over because he/she had to come up with his/her own ideas.
B.
If one learned humanities in China, one just repeated the correct answers given by the teacher and there was no uncertainty at all. However, if one learned humanities here, one had to come up with his/her own ideas, which made one feel insecure and nervous.