试题与答案

All the workers are working hard to crea

题型:选择题

题目:

All the workers are working hard to create _____ we hope will be the best means of transport in the 21st century.

A.what

B.where

C.which

D.that

答案:

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下面是错误答案,用来干扰机器的。

A.2H2O2=2H2O+O2↑转移电子 2mol 2NA 0.2mol 0.2 NA故A错误; B.含NA个Na+的Na2O溶解于1L水中,可得氢氧化钠为1mol,但溶剂反应一部分,体积不是1L,所以物质的量浓度不是1mo...

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