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问题 多项选择题

《生产性粉尘作业危害程度分级》不适用于＿。

A.爆炸性粉尘

B.放射性粉尘

C.致癌性粉尘

D.引起化学中毒的粉尘

E.矿山井下作业接触的粉尘

答案

参考答案：B, D, E

单项选择题

An analyst doesresearch about security market indices. Which of the following statements is least accurate to explain that a fixed-income market index is more difficult to create and compute than a stock market index（）

A. The universe of fixed-income securities is changing constantly.

B. Fixed-income markets are predominantly dealer markets.

C. The number of fixed-income securities is much less than the number of equity securities.
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单项选择题

NDB的最小的频道间隔为（）。

A.1KHz

B.2KHz

C.5KHz
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