搜题请搜索小程序“爱下问搜题”
问题 选择题

将m克铁片放入某溶液中反应片刻后，取出洗净、干燥、称重、结果质量大于m克．则此溶液可能是（　　）

A．盐酸

B．稀硫酸

C．FeCl2溶液

D．硫酸铜溶液

答案

A、把铁片放入盐酸中，铁片能和盐酸反应生成氯化亚铁溶液和氢气，铁片的质量减少，故选项不符合题意．

B、把铁片放入硫酸中，铁片能和硫酸反应生成硫酸亚铁溶液和氢气，铁片的质量减少，故选项不符合题意．

C、铁与FeCl2溶液不发生反应，则铁片的质量不变，故选项不符合题意．

D、把铁片放入硫酸铜溶液中，铁能与硫酸铜溶液反应生成硫酸亚铁溶液和铜，由反应时的质量比可知，每56份质量的铁可置换出64份质量的铜，铁片的质量增大，故选项符合题意．

故选D．

单项选择题

Which of the following statements about theories of the yield curve is most likely correct（）

A. A liquidity preference cannot be consistent with a flat term structure of interest rates.  B. The liquidity preference theory suggests that a downward-sloping term structure of interest rates is due to investors expecting short-term rates to decline, and although there is a maturity premium to consider, it is not large enough to offset the expectation of declining short-term rates. 

C. The pure expectations theory suggests that an upward-sloping term structure of interest rates is a consequence of investors expecting short-term rates to remain unchanged for a period of time, followed by investors expecting short-term rates to rise for a period of time.
查看答案
名词解释

IPC
查看答案