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单选题
When you do maintenance on the waste water system, do not touch your face with your gloves.
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.
答案解析
正确答案：C
