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在硫酸铝、硫酸钾和明矾[KAl（SO4）2•12H2O]的混合溶液100ml中，SO42-的浓度为0.9mol/L，当加入2mol/L KOH溶液100ml时，生成的沉淀恰好完全溶解．则原混合物中K+的物质的量浓度是______．

答案

原混合溶液中加入2mol/L KOH溶液100ml时沉淀完全溶解，发生反应Al3++4OH-=AlO2-+2H2O，加入氢氧化钠的物质的量为2mol/L×0.1mol=0.2L，由Al3++4OH-=AlO2-+2H2O可知，原溶液中Al3+的物质的量为0.2mol×

1
4
=0.05mol，故原溶液中Al3+的浓度为
0.05mol
0.1L
=0.5mol/L，根据溶液出电中性，故原溶液中有c（K+）+3c（Al3+）=2c（SO42-），所以c（K+）+3×0.5mol/L=2×0.9mol/L，解得：c（K+）=0.3mol/L，

故答案为：0.3mol/L．

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填空。

     Finally, we arrived at the World Park. The sky was blue and __1__ was beautiful. We became very

 __2__ when we saw the model Eiffel Tower from the coach! It is made of __3__ and really tall. When

  the coach stopped, we all got off quickly. Kitty and I didn't feel __4__ any more. We just wanted to go

  into the park and enjoy__5__ . Then the real __6__ came, like bombs under the ground. The earth

 started to __7__ . People ran in all __8__ . They did not know where to go. Some people ran out of the

  shopping __9__ . I tried my best to run to the street too. People were running wildly while pieces of glass

  and bricks were __10__  down. Then the walls began to come down, too.

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单项选择题

（）=利率风险特定风险+利率风险一般风险+股票风险特定风险+股票风险一般风险+汇率风险+商品风险+期权风险（Gamma和Vega）资本要求简单加总。

A.最低市场风险资本要求

B.市场风险资本要求

C.持续经营资本

D.风险资本
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