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能不能使一条等温线与一条绝热线相交两次?两条等温线和一条绝热线是否可以构成一个循环，为什么?两条绝热线和一条等温线是否可以构成一个循环?
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【简答题】8 There's a ____ to view children in the UK, and in the Western world in general, as ____ and ____ . But this isn't the case throughout the world. In many societies children work and contribute to the...
【单选题】What isn't said about the case with PCBs?
A.
An accumulation of PCBs in the human body is the direct reason of the cancer and other severe disorders.
B.
PCBs can't be disintegrated using conventional waste-treatment ways.
C.
PCBs are degraded by natural processes very slowly.
D.
PCBs have been found in high contents in the fatty tissues of fish.
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【简答题】出生后发育最为迅速的阶段为（）
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