灭菌因子
参考答案：
物理、化学或生物杀菌因子，或各因子的组合。它们能在规定条件下发挥杀菌作用.使被处理的物品达到无菌状态。
Life insurance, before available only to young, healthy persons , can now be obtained for old people, and even for pets.
A．before young, healthy persons available only,
B．available only to young, healthy persons before,
C．available only to persons young, but more healthy,
D．before young and healthy persons only available to,
道路交通系统的基本要素是指（）。
A．人
B．车
C．路
D．政策
E．天气
