【单选题】连续精馏塔设计时,当采用塔顶全凝器、泡点回流方案时,为完成分离任务所需理论板数为N。若采用塔顶分凝器,而回流比和前方案相同时,则完成同样分离任务所需理论板数为Nˊ,其相对大小是______。
【简答题】用方框中所给单词的适当形式填空。 pass pollution he waste develop 1. Air _______ is the most serious problem at the moment. 2. As we know, China is still a _______ country in the world. 3. Bruce succeeded in _...
【单选题】x09a02052连续精馏塔设计时,当采用塔顶全凝器、泡点回流方案时,为完成分离任务所需理 论板数为N。若采用塔顶分凝器,而回流比和前方案相同时,则完成同样分离任务 所需理论板数为N ˊ ,其相对大小是 ______ 。
【单选题】What the author is trying to suggest may be best interpreted as
A.
Where there is a will, there is a way.
B.
He who laughs last laughs best.
C.
Successful failures is the best remedy.
D.
More haste, less speed.
【判断题】感应电动机的负载转矩在任何时候都绝不可能大于额定转矩
【单选题】It was not until the sandstorms kept attacking north China that ______ how serious the problem was.
A.
did the people realize
B.
didn't the people realize
D.
the people did realize
【单选题】The most appropriate title for the text is______.
A.
Hurricane: The Most Serious Natural Threat
B.
Wind Farm: Human Defence Against Hurricane
C.
Hurricane: No More A Threat to Human Beings
D.
Homeland Security: A Beast That Has Been Tamed