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。 ( )

　Remove paint from the entire length of the tube with a grade 400 emery cloth in a circumferential direction of the damaged area.

　Circulate the damaged area of the pipe with a 400-grade emery cloth long enough to remove the paint.

　Remove the paint with grade 400 emery cloth from the full circumference of the tube along a sufficient length around thedamage area.

正确答案：C

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