题目内容

环己烷的爆炸下限是1.2%.，爆炸上限8.4%.，如果某场所空气中环己烷的浓度是 0.1%.，则该场所可燃气环境爆炸危险度为()%.LEL。

A. 1.19
B. 1.39
C. 8.33
D. 12.0

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听力原文：W: Would you help me for a minute, please？
M: Of course. What do you want me to do？
W: Could you hold these packages while I look for the key to the door？
M: I'd be glad to. What's in these packages？ They're extremely heavy.
W: Just the filings we need for the picnic tomorrow.
M: Well, hurry up and open the door. I told you these things were heavy.
W: I can't find the key. You must have it.
M: You are right, but how can I get the key while I'm holding all these packages？
Q6. Who has the key？
(15)

A. The woman.
B. Neither of them.
C. Both of them.
D. The man.

【B9】

A. chosen
B. allowed
C. promised
D. offered

【B2】

A. like
B. in
C. of
D. as

【B20】

A. prepare
B. ready
C. studying
D. waiting