the employing units that engage in the operations in which high toxic substances are used shall at least once a month detect factors of occupational poisoning hazards in the workplaces where high toxic substances are used and shall evaluate the effect of control over occupational poisoning hazards at least once every six months
从事高毒作业的用人单位应当至少每月对使用高毒作业场所的职业中毒危害因素进行一次检测，至少每六个月对职业中毒危害控制效果进行一次评价
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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