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【单选题】
既可以用来鉴别乙烯和甲烷，又可以用来除去甲烷中混有的乙烯，得到纯净的甲烷的方法是（ ）A.
与足量的溴水反应
B.
通过澄清石灰水
C.
酸性KMnO 4 溶液
D.
浓硫酸
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举一反三
【简答题】______:单心皮构成,子房1室,胚珠着生在腹缝线上。
【单选题】Portia’s suitors must pick from three caskets, which are made of gold, silver and lead. Which contains the portrai of Portia and turns out to be the correct one?
A.
Gold
B.
Silver
C.
Lead
【单选题】Henry Jamess most important works include the following EXCEPT
A.
The American.
B.
The Portrait of a Lady.
C.
The Wings of the Dove.
D.
An American Tragedy.
【简答题】一位社会工作者正在与一位遭受家庭暴力的女性一起工作，该女性常常被丈夫毒打，工作者经过评估认为她留在家中的话丈夫的暴力行为会越演越烈，但她还是不愿意选择离家。工作者在处理这种情形时应主要考虑（ ）原则。
【单选题】D.H. Lawrence was born in a working class family in 1885 when England was at the full development of its industry. His father was a coal-miner, so he knew what it was like to be poor. But his mother s...
A.
a coal-miner
B.
a teacher of English
C.
an English writer
D.
anyone but a miner
【简答题】荚果是单心皮构成，子房1室，成熟时沿背、腹缝线自上而下同时裂开。( )
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