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问题 多项选择题

运送爆破材料时，由井口总信号把钩工必须通知提升机司机和井底或中间各水平总信号把钩工，并说明爆破材料（）。

A.类型

B.数量

C.提升时间

答案

参考答案：A, B, C

单项选择题

In your project, if the benefit cost ratio is greater than 1, it means that______.

A．the ratio of profits to cost is greater than 1

B．the ratio of revenue to cost is greater than 1

C．you should select this project from all other competing alternatives

D．none of the above
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名词解释

土块
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