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【简答题】
隔气层是为了防止______层中的水分进入保温层而设置的。
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反馈参考答案：
举一反三
【单选题】听力原文： Our environment is being polluted faster than the nature and man's present efforts can prevent it. Time is bringing us more people, and more people will bring us more industry, more motor vehicl...
A.
It's because there are many developing nations.
B.
Ws bemuse people use too many man-made materials.
C.
It's because we have more and more industry.
D.
It's because we are building more vehicles.
【单选题】听力原文： Our environment is being polluted faster than the nature and man's present efforts can prevent it. Time is bringing us more people, and more people will bring us more industry, more motor vehicl...
A.
It's because there are many developing nations.
B.
It's because people use too many man-made materials.
C.
It's because we have more and more industry.
D.
It's because we are building more vehicles.
【单选题】听力原文： Our environment is being polluted faster than the nature and man's present efforts can prevent it. Time is bringing us more people, and more people will bring us more industry, more motor vehicl...
A.
It's because there are many developing nations.
B.
It's because people use too many man-made materials.
C.
It's because we have more and more industry.
D.
It's because we are building more vehicles
【单选题】The doctors have tried very hard rescuing from the vital brain damage, but all their efforts went ______.
A.
in vain
B.
in no way
C.
without effect
D.
without fail
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