Sediment collects in a tubular purifier （）.<br>A:on top cover<br>B:on sides of bowl<br>C:in drain line on the discs<br>D:on the discs

Sediment collects in a tubular purifier （）.
A:on top cover
B:on sides of bowl
C:in drain line on the discs
D:on the discs

出自：海船船员证

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