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【单选题】
标定 KMnO 4 常用基准物质A.
Cr 2 O 7 2-
B.
二苯胺磺酸钠
C.
Na 2 CO 3
D.
Na 2 C 2 O 4
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反馈参考答案：
举一反三
【单选题】The one who buy insurance is called ( )
A.
an insurance company
B.
a broker
C.
the insured
D.
an insurer
【简答题】What is one obvious presupposition of a speaker who says; Where did he buy the beer? Your watch is broken. We regret buying that car.
【单选题】The one who buy insurance is called ( ).
A.
the insurance company
B.
the broker
C.
the insurer
D.
the insured
【单选题】根据以下信息,采用 中点法 计算酒店房间的需求价格弹性。 若P = $70,则Q d = 5000 若P = $90,则Q d = 3000
A.
0.5
B.
1.4
C.
2.0
D.
3.0
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