下列说法中正确的是（） A．在其它条件不变时，氧气的溶解

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下列说法中正确的是（　　）

A．在其它条件不变时，氧气的溶解度随温度的升高而减小

B．30g硝酸钾溶解到70 g水中恰好饱和，则硝酸钾的溶解度为30 g

C．不饱和溶液转化为饱和溶液，溶液中溶质的质量分数一定增大

D．温度一定时，析出晶体后的溶液一定是该溶质的饱和溶液

答案

单项选择题

下述哪项检查对肾前性急性肾衰竭与急性肾小管坏死鉴别诊断最有意义

A．尿钠含量

B．尿量

C．血尿素氮

D．血肌酐

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小题2:The aim ________education should be to teach students how to think rather than what to think.

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小题5:________the other hand, technological advances have created many problems that threaten our human existence.