试题与答案

《阳春白雪》是()曲。

题型:填空题

题目:

《阳春白雪》是()曲。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:回采工作面冒顶前的征兆有:(1)顶板连续发生断裂声;(2)片帮增多,煤壁被压酥;(3)木支架折断;(4)瓦斯涌出量增大,淋水增加。

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