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【单选题】
酸碱滴定中选择指示剂的原则是A.
指示剂应在pH=7.0时变色
B.
指示剂的变色点与化学计量点完全符合
C.
指示剂的变色范围全部或部分落入滴定的pH突跃范围之内
D.
指示剂的变色范围应全部落在滴定的pH突跃范围之内
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【单选题】Why was the writer pleaded with to take chemistry or biology?
A.
Beause her professor in Yale advised her to take chemistry or biology.
B.
Because her mother attempted to persuade her to take chemistry or biology.
C.
Because she was from China.
【单选题】Organometallic chemistry combines aspects of organic chemistry with , and is formally defined as the study of compounds containing metal-carbon bonds, although many "organometallic compounds" contain ...
A.
those of inorganic chemistry
B.
inorganic chemistry
【单选题】( ( ) 年,冯特在德国莱比锡大学建立第一个心理学实验室被界定为科学心理学的诞生 。 ) 年,冯特在德国莱比锡大学建立第一个心
A.
17
B.
1879年
C.
1798年
D.
1897年
【简答题】有人说：“因为海水含盐量高，所以海水中溶氧含量比淡水的低”。你认为这种说法对不对？
【简答题】A．Chemistry isn't hard for him. B．Physics is easy for him. C．Chemistry is easier than Physics for him. D．Physics is easier than Chemistry for him.
【单选题】What is ytical chemistry?
A.
The study of how chemicals react
B.
The ysis of other chemistry studies
C.
The identification, isolation, and measurement of chemicals
D.
The most advanced form of chemistry
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