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【单选题】
某卤代烷烃 C 5 H 11 Cl发生消去反应时,可以得到两种烯烃,则该卤代烷烃的结构可能为
A.
CH 3 -CHClCH2CH 2 CH 2 CH 3
B.
CH 3 CH 2 C(CH3)Cl-CH 3
C.
CH 3 CH 2 CH 2 CH 2 Cl
D.
CH 3 CH 2 -CHCl-CH 2 CH 3
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【简答题】（5分）某化学小组为验证某面包膨松剂由碳酸氢钠和碳酸氢铵两种物质组成，设计如图所示实验（实验开始前弹簧夹都处于关闭状态）。 资料：①面包制作过程中发生化学反应是2NaHCO 3 △ Na 2 CO 3 +H 2 O+CO 2 ↑ NH 4 HCO 3 △ NH 3 ↑+H 2 O+CO 2 ↑ ②氨气极易溶于水，其水溶液称为氨水。 （1）装置C的作用是 。 （2）证明此膨松剂中含有碳酸氢铵的实验操...
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The plane is landing in 5 minutes.
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The flight is boarding at Gate 4.
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【简答题】（5分）某化学小组为验证某面包膨松剂由碳酸氢钠和碳酸氢铵两种物质组成，设计如图所示实验（实验开始前弹簧夹都处于关闭状态）。 资料：①面包制作过程中发生化学反应是2NaHCO 3 △ Na 2 CO 3 +H 2 O+CO 2 ↑ NH 4 HCO 3 △ NH 3 ↑+H 2 O+CO 2 ↑ ②氨气极易溶于水，其水溶液称为氨水。 （1）装置C的作用是 。 （2）证明此膨松剂中含有碳酸氢铵的实验操...
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【单选题】According to the broadcast, which of the following statements is NOT true?
A.
The plane is landing in 5 minutes.
B.
The flight is boarding at Gate 4.
C.
The number of the Flight is A23.
D.
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【单选题】Which of the following is NOT a reason for the easy raising of the parrot?
A.
It eats very little.
B.
Its food is inexpensive.
C.
It does not need a house-sitter.
D.
It does not require daily walks as dogs do.
查看完整题目与答案
【单选题】Which of the following is a L-type calcium channel blocker
A.
Nifedipines
B.
Amlodipines
C.
Diltiazem
D.
All of the above
查看完整题目与答案
【单选题】属于生物膨松剂的是
A.
固体发酵粉
B.
碳酸氢铵液
C.
活性干酵母
D.
碳酸氢钠粉
查看完整题目与答案
【单选题】Which word in the following is the best to summarize the sentence, 'Latin people shout a lot. '? ______
A.
Silent.
B.
Noisy.
C.
Lively.
D.
Active.
查看完整题目与答案
【判断题】碳酸氢钠是生物膨松剂。( )
A.
正确
B.
错误
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