Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service?（）<br>A:Copper<br>B:Copper and carbon<br>C:Carbon<br>D:Bronze

Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service?（）
A:Copper
B:Copper and carbon
C:Carbon
D:Bronze

出自：海船船员证

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