单选题石油的毒害性常用TLV来表示，TLV是指（）。A紧急暴露极限B半数致死浓度C有害气体浓度临界值D有害气体最大容许浓度
单选题
石油的毒害性常用TLV来表示，TLV是指（）。
A
紧急暴露极限
B
半数致死浓度
C
有害气体浓度临界值
D
有害气体最大容许浓度
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