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【单选题】
HAc 的 K a = 1.76×10 - 5 , 欲配制 pH = 4.50 的缓冲溶液 , 若用 HAc 及 NaAc 配制 , 则二者的浓度比 c NaAc / c HAc 为A.
等于 1
B.
大于 1
C.
大于 2
D.
小于 1
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反馈参考答案：
举一反三
【单选题】—Mum, can I go to the zoo with Linda? —When your homework ____, you can.
A.
is finished
B.
was finished
C.
finishes
【单选题】—May I go to play football with my friend, Dad? —_____ you _____ your composition yet? [ ]
A.
Are, finishing
B.
Have, finished
C.
Did, finish
【简答题】按直线与三个投影面之间的相对位置,可分为:( ),( ),( )。
【单选题】—Linda, Dad has finished his work and we ________ to the gym to pick you up. —Thank you, Mum.
A.
drive
B.
drove
C.
have driven
D.
are driving
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