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【单选题】
要配制pH=5.0的缓冲溶液,选用下列哪个缓冲对:
A.
HCOOH-HCOO-
B.
HAc-Ac-
C.
(NaH2PO4)- Na2HPO4
D.
(HCO3)--CO3(2-)
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【单选题】Once again he failed to hand in his homework he had been given enough time to do it.
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【单选题】Byrd at once ordered them to do this, he ordered them to do this____.
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once
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soon
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【多选题】按表现形式分类，通货膨胀可分为( )。
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【单选题】Once he makes up his mind to do something, he will devote himself _________to it.
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【单选题】Byrd at once ordered them to do this. He ordered them to do this ______.
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