When you do maintenance on the waste water system, do not touch your face with your gloves. 在维修废水系统时，切勿用手套触摸面部：
A.When you do maintenance on the waste water system, make sure that your gloves are put on. B.Face away from waste water system when you do maintenance on it with gloves. C.Face away from your gloves when you do maintenance on the waste water system.正确答案C
