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【单选题】
关于制冷剂下列说法不正确的是（）A.
CFC类物质就是不含氢的氟里昂，对大气中的臭氧和地球高空的臭氧层有严重的破坏作用
B.
HCFC类物质含有氯原子，但分子结构中部分的氯原子被氢原子替代，对大气臭氧层的破坏作用较弱
C.
HFC类物质是不含氟原子的制冷剂，对大气臭氧层没有破坏作用
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皮皮学刷刷变学霸
举一反三
【单选题】Where do Kino and Juana first take refuge after their house burns down?
A.
In a cave by the beach.
B.
In their canoe.
C.
At Juan Tomas’s house.
D.
In the forest.
【简答题】In reading we appear to withdraw into a world of imagination, a few people seek refuge too readily in this and prefer it always to the world of everyday, but they are missing the full significance if ...
【简答题】FRANCE has destroyed the hopes of those who had planned to take refuge（避难）in one of the few places on Earth which some believe will be spared when the world ends on December 21 ．Local officials banned...
【简答题】During the air attacks by German Nazis, Londoners the Underground stations. (take refuge in)
【单选题】适量运动可促进神经系统的( ),脑的重量和大脑皮质厚度( ),大脑皮质表面积( )。
A.
生长发育；部分增加；减小
B.
改造；都增加；增大
C.
生长发育；都增加；增大
D.
生长发育；都增加；缩小
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