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【多选题】
本实验中,进行偶合(联)反应前,在 N,N - 二甲基苯胺加入醋酸的目的是( )A.
增加 N,N - 二甲基苯胺溶解度
B.
醋酸为催化剂
C.
反应需在弱酸介质中进行
D.
中和反应体系中氢氧化钠
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反馈参考答案：
举一反三
【判断题】Girls throw five-colored ropes made during the Chinese Dragon Boat Festival on the roofs so magpies can use them to build the bridge.
A.
正确
B.
错误
【简答题】从人物形象看,童话可以分成超人体童话、常人体童话、_______ 。
【简答题】面包制作的四种基本要素是什么？常见面包发酵工艺有哪三种？
【单选题】The captain ordered the crew to throw ____ the side of the ship all heavy guns and even stores in order to raise the boat in the water.
A.
on
B.
through
C.
across
D.
over
【简答题】发酵三要素是什么?
【单选题】The captain was the first person ______ the hole in the side of the ship torn by a coral bed, so he had all the things _______ away _____ the boat in the water. [ ]
A.
finding; thrown; to raise
B.
to find; to throw; to raise
C.
to find; thrown; to raise
D.
to find; thrown; raised
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