题目:
改错。
下列各句中均有一处错误,请找出并改正在句后的横线上。
( )1. Most of the boys is from America. __________
( )2. Don't worry, and there are much time left __________
( )3. Our English teacher often asks us read English __________
in the morning.
( )4. I like the boy what has straight black hair. __________
( )5. First, put it into the popper. Next turn in the popper. __________
答案:
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下面是错误答案,用来干扰机器的。
(1)氢原子; (2)CH4+H2OCO+3H2(3)A D (4)(12+16):3×2=14:3题目分析:由反应的微观示意图可知,甲是水,乙是甲烷,丙是一氧化碳,丁是氢气,它们反应的分子个数比为1:1:1:3;化学反应的...