with句型？ this is the maximum concentration to which workers can be exposed for a period up to 15 minutes continuously. there should be no more than four such excursions per day with at least 60 minutes between exposure limits and the daily tlv-twa limit must not be exceeded. the tlv-stel limit must not be exceeded at any time during the period of exposure. 找到以下类似的说法： short-term exposure limit (stel)—the american conference of governmental industrial hygienists (acgih) maximum concentration to which workers can be exposed for up to 15 minutes continually. no more than four excursions are allowed per day, and there must be at least 60 minutes between exposure periods. the daily threshold limit value-time weighted average (tlv-twa) may not be exceeded. threshold limit value (tlv)—an american conference of governmental industrial hygienists (acgih) concentration of a substance to which most workers can be exposed without adverse effect. the tlv may be expressed as a time weighted average (twa), as a short-term exposure limit (stel), or as a ceiling limit (cl). time-weighted average (twa)—an allowable exposure concentration averaged over a normal 8-hour workday or 40-hour workweek. ceiling value—a concentration of a substance that should not be exceeded, even instantaneously. 这里应该讲的是stel。 这是工人能连续接触15分钟允许的最大浓度。每天超出限值的偏差应不多于4次，且每次之间时间间隔至少60分钟，还不能超过时间加权平均阈限值。在接触期间任何时候都不能超过短时间接触阈限值。查看更多
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