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【单选题】
298K 时 100g 水中溶有 1g 非电解质,测得其凝固点为 -0.31°C ,已知水的 K f =1.86K·kg·mol -1 ,该物质的摩尔质量是:A.
30
B.
36
C.
60
D.
56
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举一反三
【多选题】There are sme stages of overall analytical process in an environmental investigation.Which of the following are correct?（ ）
A.
definition of the aims；
B.
selection and development of appropriate method；
C.
sampling plan，sample collection，sample handing and pretreatment；
D.
separations；
E.
final measurements;
F.
method validation;
G.
assessment and interpretation of results;
H.
safety；
【简答题】[A] stages [B] periods [C] years [D] sessions
【简答题】The stages of sleep take on ____Sleep is part of a person's daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If you are an average sleeper, your sleep c...
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