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【单选题】
已知 HAc 的 pK a = 4.75 ,现有 1 升 HAc-NaAc 缓冲溶液,其 p H=5.40 。为使该溶液 的缓冲容量增大,可以适当加入A.
2 mol·L -1 NaOH
B.
H 2 O
C.
2 mol·L -1 Na Cl
D.
2 mol·L -1 HCl
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A.
T
B.
F
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A.
T
B.
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【多选题】which of the following choices are the key points of cheongsam?
A.
It has a long history
B.
I t is an exquisite Chinese dress
C.
Easy to slip on and comfortable to wear
D.
The measurement of body generally requires only 4 positions on the body
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