Which of the filter/strainer units listed permits you to clean the element while leaving the system on the line?（）<br>A:Simplex<br>B:Duplex<br>C:Canister<br>D:Bypass

Which of the filter/strainer units listed permits you to clean the element while leaving the system on the line?（）
A:Simplex
B:Duplex
C:Canister
D:Bypass

出自：海船船员证

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