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问题 名词解释

过硫

答案

参考答案：

硫化程度过了。

填空题

要做一个底面直径是2分米，长4米的烟囱，至少需要______平方分米铁皮．
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观察下图后回答问题：  

（1）下图是反映红军长征的场面，你能为这三幅画写个题目吗？

    ①                                                                                                                                                      ②                                                                                                                                                      ③                                                                                                                                                  （2）21世纪的今天，我们是否有必要发扬长征精神，请谈谈你的看法。                                                                                                                                                                                                                                                                                                                                 

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