单项选择题

醋酸（HAc）在pH=3.0时（pKa=4.74），溶液中Ac-的分布系数（δ）为
A、0.018
B、0023
C、0.048
D、0.055

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多项选择题

用于砌筑砖砌体的砂浆强度主要取决于( )。 A.
水泥用量 B.
砂子用量 C.
水灰比 D.
水泥强度等级

多项选择题

-Hi, may I have a ticket to Beijing, please?
-
-this afternoon, please.
- A.
of course, where do you want to go? B.
Sure. When do you want to travel? C.
You're welcome. D.
Okay, here is your ticket and the receipt.