There is a （） system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders.<br>A:recirculating<br>B:total loss<br>C:cooling<br>D:refrigeration

There is a （） system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders.
A:recirculating
B:total loss
C:cooling
D:refrigeration

出自：海船船员证

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