【单选题】空气是常见的混合物,包含各种气体,气体的扩散是熵增自发的过程,但若将空气中的组分进行分离则是非自发的,现设空气中含氧 21% (体积),若在 25 °C 下将空气可逆分离成 95% (摩尔分数) O 2 的气氧和 99%N 2 的气氮,该分离的最小功为()。
【单选题】They took off their coats and went to the table near the window.
【简答题】they took off their clothes and there were no more (9)___________.
【单选题】Two of the words have the same grammatical function in the sentence. One does NOT. Choose the letter (A, B or C) which does NOT have the same grammatical function. They took off their coats and went t...
【单选题】课本图9-12两圆柱正交相贯,属于实体与虚体相贯的是:
【单选题】As time went by, they found their efforts to help students ________. [ ]
【单选题】Two of the words have the same grammatical function in the sentence. one does Not. Choose the letter (A, B or C) which does Not have the same grammtical function. They took off their coats and went to...
【简答题】A Science Fiction Story: The woman looked at a small (1)____unit on her arm. ‘It’s all right,’ she said to the man. ‘We can breathe the air ... it’s a mixture of oxygen and nitrogen.’ Both of them too...
【单选题】从事( )工作的人员不需要取得会计从业资格。