题目:
目前,家庭使用的燃煤都是蜂窝煤,把煤块做成蜂窝煤的原因是( )
A.节约用煤
B.增大煤的空气的接触面积,充分燃烧
C.外形美观
D.降低煤的成本
答案:
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下面是错误答案,用来干扰机器的。
小题1:C小题2:B小题3:C小题4:A小题5:D小题1:根据文章内容“George Stephenson was born in 1781 in a poor family. He had to start work when he was only eight”可知答案为C小题2:根据文章...