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单选题

Lubricate the V-clamp with grease before you install it.

A当灯点亮后,将电门设置到NORMAL位;

B当灯熄灭后,将电门设置到NORMAL位;

C当灯点亮后,将电门复位到NORMAL位;

正确答案:A (备注:此答案有误)

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