The request while monitors PC-TWA, changes the bigger operating location to the density, carries on the monitor appraisal.
要求在监测PC-TWA 的同时，对浓度变化较大的工作地点，进行监测评价。
PC - STEL is with the PC-TWA necessary one kind of short time contact limiting value, must conform to the contact limiting value which the formulation contact limiting value or calculates.
STEL是与PC - TWA相配套的一种短时间接触限值，必须符合制定的接触限值或推算出的接触限值。
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