【名词&注释】
螺旋桨(propeller)、轴系理论中心线、符合规定(conforming to prescribed)
[单选题]Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the () and a recirculation system lubricating the running gear and cooling the piston.
A. cylinder liners and piston rings
B. main bearings
C. crankpin bearings
D. turboblower