（）sometimes called filter, is a device designed to prevent the passage of unwanted solids into the system.<br>A:Steam trap<br>B:Check valve<br>C:Separator<br>D:Strainer

（）sometimes called filter, is a device designed to prevent the passage of unwanted solids into the system.
A:Steam trap
B:Check valve
C:Separator
D:Strainer

出自：海船船员证

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