[单选] The airborne concentrations of substances (such as H₂S) under which nearly all workers may be repeatedly exposed without adverse effects are called（）.

A . exposure limits
B . concentration limits
C . threshold limit values
D . substance limit value

汉代察举制的主要科目有（）。孝廉。贤良文学。茂才。方正。德才。以下四种汉字输入法中，（）不是中文Windows 2000预装的输入法。智能ABC输入法。区位码输入法。郑码输入法。五笔字型输入法。认证人员自被撤销执业资格之日起（）年内，认证人员注册机构不再受理其注册申请。 2。 3。 4。 5。在使用指针式万用表时，其表针偏转在（）位置，所选择量程的读数较准确。右边一点的。不过中间的。满刻度的二分之一至三分之一。没有要求，只要能读数就可以了。小米头一批推上市的十万台手机（）时间卖掉的。一小时。半小时。十分钟。三分零五秒。 The airborne concentrations of substances (such as H₂S) under which nearly all workers may be repeatedly exposed without adverse effects are called（）.

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[单选] The airborne concentrations of substances (such as H2S) under which nearly all workers may be repeatedly exposed without adverse effects are called（）.

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[单选] The airborne concentrations of substances (such as H₂S) under which nearly all workers may be repeatedly exposed without adverse effects are called（）.