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单项选择题
The General Rule of Addition is used to compute:
A． the probability of two or more collectively exhaustive events.
B． subjective probabilities.
C． the probability of two events, which are not mutually exclusive.
D． the probability of two or more independent events.
B． subjective probabilities.
C． the probability of two events, which are not mutually exclusive.
D． the probability of two or more independent events.
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问答题
什么叫倾泻法，洗涤沉淀时，为什么用洗涤液或水都要少量、多次？为保证BaSO4沉淀的溶解损失不超过0.1%，洗涤沉淀用水量最多不超过多少毫升？
答案：
操作方法是将漏斗放在漏斗架或铁圈上，接受滤液的烧杯放在漏斗下面，漏斗颈下端在烧杯边沿以下3～4cm处，并与烧杯内壁紧贴，...
