职工搬运重物时，如果提举姿势不正确，（）最容易受伤。 ["颈","腰","小腿"]
常态天然气可以直接向用户供应。
下列属于团体保险的特征的是（） ["用对集体的选择来代替对个别被保险人的选择","手续简化","保险费率优惠","可以免除体检","使用团体保单"]
根据联合国规定：当一个国家或地区60岁以上老龄人口数超过人口总数的10%或65岁以上老龄人口数超过（）就称为老龄化国家或地区。 ["6%","7%","8%","9%"]
CO2 cylinders equipped with pressure actuated discharge heads will discharge automatically when（）. ["the discharge valve is open","the control box glass is broken","pressure from the control cylinders is detected","the control cylinders have been completely discharged"]
工商专网划分为（）和（）
