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问题 单项选择题

粒细胞缺乏症是指外周中性粒细胞数持续低于

A．4.0×109/L
B．3.0×109/L
C．2.0×109/L
D．1.0×109/L
E．0.5×109/L

答案

参考答案：E

选择题

________its low cost, the appeal of iron as a building material lies in its strength, its resistance to fire, and its potential to span long distances.

A．Other than

B．Apart from

C．Except for

D．Rather than
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单项选择题

掘进工作面供风量必须充足，能够满足稀释CH4、CO2等气体和《煤矿安全规程》规定的最低风速要求，其中岩巷掘进不低于（）。

A、0.10m/s

B、0.15m/s

C、0.20m/s

D、0.25m/s
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