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问题 选择题

已知298.15 K时，可逆反应：Pb2+(aq)+Sn(s)Pb(s)+Sn2+(aq)的平衡常数K=2.2，若溶液中pb2+和Sn2+的浓度均为0.10 mol·L-1，则此时反应进行的方向是 [ ]

A.向正反应方向进行

B.向逆反应方向进行

C.处于平衡状态

D.无法判断

答案

答案：A

选择题

In _________ 1990’s, he was still so poor ________ student that nobody could imagine how rich he would be in the future.

A．/; a

B．the; a

C． /; /

D．the; /
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选择题

It’s generous __ ___ them to donate money to UNICEF. They think it important _____ them to help poor children go to school.

A．to; for

B．for; of

C．of; to

D．of; for
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