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单选题
3220. 用400级砂布从管子的整个圆周上沿着损坏区域的足够长度去除油漆。
A
Remove paint from the entire length of the tube with a grade 400 emery cloth in a circumferential direction of the damaged area.
B
Circulate the damaged area of the pipe with a 400-grade emery cloth long enough to remove the paint.
C
Remove the paint with grade 400 emery cloth from the full circumference of the tube along a sufficient length around the damage area.
答案解析
正确答案：C
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