[名词解释] R&D

CDM 人体对电流反应（）毫安没有感觉对人体无伤害。 ["0-0.5","1-5","10","15"] 节能减排 服务外包 当进入受限空间当空气中易燃性粉尘相对集中，从而使可视距离在（）以内模糊时；会产生易燃易爆。（ ["1.0m","2.0m","1.5m","2.5m"] R&D