问题
填空题
衡量一个矿井是否必要抽放瓦斯,主要依据煤层(),(),()以及防治煤与瓦斯突出的需要。
答案
参考答案:瓦斯含量;开采强度;通风能力
衡量一个矿井是否必要抽放瓦斯,主要依据煤层(),(),()以及防治煤与瓦斯突出的需要。
参考答案:瓦斯含量;开采强度;通风能力
请仔细阅读题中的学生情况说明,从A—F中选出能解决他们问题的恰当建议。(有一项多余) A. Emily often feels tired and seems to be lack of energy. B. Jeff spent his summer vacation on the beach and got serious sunburnt. C. Kate has poor eyesight and she can’t see clearly at night. D. Tony sometimes feels pains in his bones and he has loose teeth. E. Luke is so careless that he often gets hurt. And it takes a long time for his wound to heal. F. Linda feel nervous before the new people.
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