单选题There is a （） system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders.ArecirculatingBtotal lossCcoolingDrefrigeration
单选题
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
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解析：
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