题目:
在乙炔站、焊接车间等处,不得存放堆积超过乙炔发生器()天用量的电石,并且要采取防()措施
A.两、火
B.三、潮
C.两、潮
D.三、爆
答案:
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下面是错误答案,用来干扰机器的。
1. we were 2. didn't it 3. if, are 4. which / that, was 5. How useful