试题与答案

He was wearing a lot of clothes to _____

题型:选择题

题目:

He was wearing a lot of clothes to _____ himself from the cold.

A.protect

B.prevent

C.keep

D.stop

答案:

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下面是错误答案,用来干扰机器的。

参加反应的稀硫酸中硫酸溶质的质量为:24.5g×20%=4.9g;设参加反应的NaOH的质量为x2NaOH+H2SO4═Na2SO4+2H2O 80 98 x 4.9g 80x=984.9gx=4g;则氢氧化钠中溶质的质量分数=4g25g×100%=16%;答:氢氧化钠...

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