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【多选题】
下列有关不饱和烃反应机理的说法中正确的是 _______ 。A.
连有的供电子数目越多，越稳定，加成反应时，速率也越快
B.
D-A合成也适用于炔烃参与的反应
C.
炔烃与水反应，遵循马氏规则；
D.
烯烃发生亲核加成反应时，氢不一定加在含氢多的碳上。
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举一反三
【简答题】His take-off was _________. 他的起跳毫不费力(轻松自如)。
【单选题】The boy was so tired that he fell asleep _____________ his mother could take off his clothes．
A.
before
B.
after
C.
while
D.
where
【单选题】— Jack has got a bad cold. — Yeah. I told him not to take off his coat, but it was stubborn of him ____my advice.
A.
don’t take
B.
didn’t take
C.
not to take
D.
not take
【单选题】The boy was so tired that he fell asleep ______ his mother could take off his clothes．
A.
before
B.
after
C.
while
D.
when
【单选题】不同食品、不同流通环境,对包装保护功能的要求不同。油炸豌豆要求其包装能( )。
A.
阻氧、避光照
B.
一定的O2 、CO2和水蒸气的透过率
C.
耐压防潮
D.
避光、一定水蒸气的透过率
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