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【单选题】
下图为实验室制取少量乙酸乙酯的装置图。下列关于该实验的叙述中，不正确的是（）。A.
向a试管中先加入浓硫酸，然后边摇动试管边慢慢加入乙醇，再冰醋酸
B.
试管b中导气管下端不能浸入液面的目的是防止实验过程中产生倒吸现象
C.
实验时加热试管a的目的之一是及时将乙酸乙酯蒸出，使平衡向生成乙酸乙酯的方向移动
D.
试管b中饱和Na 2 CO 3 溶液的作用是吸收随乙酸乙酯蒸出的少量乙酸和乙醇
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举一反三
【单选题】How did the robot behave at the beginning of the test?
A.
It rotated its wings through 90 degrees
B.
It twitched（骤然一抽）but gradually gained height
C.
It was twitched and broke down
D.
It landed not 10ng after the test
【单选题】How did the robot behave at the beginning of the test?
A.
It rotated its wings through 90 degrees．
B.
It twitched but gradually gained height．
C.
It was twitched and broke down．
D.
It landed not long after the test．
【简答题】集体利益强调国家利益、社会整体利益高于()。
【简答题】Airplanes come in many different shapes and sizes depending on the mission of the ____1____, but all modern airplanes have certain components in common. These are the fuselage, wing, tail assembly and...
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