For a purifier changing to a gravity disc with smaller hole diameter will move the interface towards the（）.<br>A:bowl periphery<br>B:bowl center<br>C:upper surface<br>D:lower surface

For a purifier changing to a gravity disc with smaller hole diameter will move the interface towards the（）.
A:bowl periphery
B:bowl center
C:upper surface
D:lower surface

出自：海船船员证

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