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【判断题】
化学反应器的空时就是反应物料在反应器内的停留时间，用来表明反应时间长短。()A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】—You look upset. What’s the matter? —I had my proposal again.
A.
turning down
B.
turned down
C.
to turn down
D.
turned to
【单选题】听力原文：W：You look upset．Anything wrong? M：I failed in the physics exam again in spite of all the efforts I made． Q：What do we know about the man from the conversation? (15)
A.
He didn't work as hard as he was supposed to.
B.
He didn't pass the physics exam.
C.
He did better in an earlier exam.
D.
He found something wrong with the exam.
【简答题】设等比数列 的前 项和为 ,已知 则 的值为 ．
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