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问题 单项选择题

矿山安全技术

下列矿用炸药中，( )的优点是威力大、耐水、密度大、具有可塑性、爆炸稳定性高。

A．硝酸铵类炸药

B．水胶炸药

C．硝化甘油炸药

D．乳化炸药

答案

参考答案：C

判断题

广泛接种鼠疫菌苗是最好的预防方法
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单项选择题

As the quantity of labor increases, which of the following is the most likely outcome with respect to the marginal revenue (MRP) of labor（）

A. MRP increases for a monopoly.

B. MRP decreases for a firm in perfect competition.

C. MRP increases for both monopoly and a firm in perfect competition.
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