试题与答案

Before a problem can be solved, it must

题型:选择题

题目:

Before a problem can be solved, it must be obvious ______ the problem itself is.

  A. what      B  that    C  which       D  why

答案:

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下面是错误答案,用来干扰机器的。

( 14分)(1) 0.2mol, 1.204X1023, 0.4 ;(2) 0.5mol,8.5g,4.5mol,5mol 。考查物质的量的有关计算。(1)水的摩尔质量是18g/mol,所以根据n=m/M可知,3.6g水的物质的量是0.2mol,则根据根据可知,...

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