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有一种新合成的化学物质,拟应用于化妆品中,先需对其进行安全性评价。提示:在该化学物安全性评价的基础上,结合其危险度评价的资料来制定其安全限值(卫生标准)。用NOAEL或LOAEL除以安全系数,其中不属于安全系数确定应考虑的因素的是()
支柱护坡应延伸至(),并做深度不小于()护坡基础。
辽宁旅游度假区的基本类型可以划分为( )。
居民上班或外出离家前,应注意做到()。
反映病害发生普遍程度的指标是()。
什么是反射四通?怎样使用四通?
甲状腺功能亢进症的特征性表现不包括()
新生儿窒息复苏胸外按压的深度为()
下列各种配合煤中,那种煤的挥发份最高()。
订货管理数据库有4个表: 仓库(仓库号,城市,面积) 职工(仓库号,职工号,工资) 订购单(职工号,供应商号,订购单号,订购日期) 供应商(供应商号,供应商名,地址) 各个表的记录实例为: 用SQL语句完成操作:删除目前没有任何订购单的供应商。
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