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【单选题】
下列溶液中不能组成缓冲溶液的是A.
NH 3 和 NH 4 Cl
B.
NaH 2 PO 4 和 Na 2 HPO 4
C.
HCl 和过量的氨水
D.
氨水和过量的 HCl
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举一反三
【单选题】All the following sentences definitely Indicate future time EXCEPT______.
A.
Mother is to have tea with Aunt Betty at four
B.
The school pupils will be home by now
C.
The President is coming to the UN next week
D.
He is going to email me the necessary Information
【简答题】根据句意及汉语提示完成下列句子 1. My mother bought me a （围巾）as a birthday present. 2. （每个人）is having a good time at the party. 3. We are very____（放松的）on the beach 4. Where are they going on （度假）? 5. In this____（热天）,...
【简答题】本月销售B产品若干台,不含税金额为300 000元,增值税48 000元,货款尚未收到,购货方承诺一个月后支付。
【简答题】根据释义，写出相应的单词。 1. ____________ father and mother 2._____________ father or mother's parents 3._____________ mother's brother 4._____________ father or mother's sister 5._____________ uncle or aunt's ...
【单选题】Mother wanted to be a good provider, a role she _______ since her marriage to Father.
A.
shoulders
B.
has been shouldering
C.
is shouldering
D.
shouldered
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