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【单选题】
下列溶液具有缓冲作用的是 ( ) 。A.
食盐和铵盐组成的水溶液
B.
盐酸和苛性碱组成的水溶液 prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
C.
碳酸和纯碱组成的水溶液
D.
醋酸和它的钠盐组成的水溶液 prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
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反馈参考答案：
举一反三
【单选题】You can't fancy what great trouble they have _______ the problem ________. [ ]
A.
to solve; being discussed
B.
solving; discussing
C.
to solve; to discuss
D.
solving; being discussed
【简答题】He always has great trouble (understand) _____ what the teacher says in class.
【单选题】--- ________ great fun chatting online is！ ---But it may cause you a lot of trouble.
A.
What a
B.
How
C.
What
D.
How a
【简答题】Mary always has great trouble (understand)______what the teacher says in class.
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