正确答案: B
蜡烛燃烧后质量变小,是因为蜡烛受热形成了石蜡蒸气
题目:下列对化学反应前后质量变化的解释,不符合质量守恒定律的是
解析:B
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学习资料的答案和解析:
[单选题]_____________
make
[单选题]--Whydidn'tyougotothecinemawithusthisafternoon?--I______atthestationformyunclefromBeijing.
waswaiting
[单选题]2. She prefers _______ go by train _______ by air.
to; rather than
解析:2.B【解析】“prefer+名词/动词不定式+rather than +名词/动词不定式”句型,表示“喜欢……胜过 ……,’。
[单选题]I found _________ really difficult for me to guess the meaning of the word.
it
解析:1.B【解析】it在此作形式宾语。其余三个代词均不可作形式宾语。