单项选择题
A.Send the wiper into the well with only a scoop and pail
B.Remove the bilge manifold valve and attempt to back flush the line
C.Simultaneously operate all available bilge pumps
D.It is only necessary to transfer half the contents of a drum of degreaser into the bilge well
单项选择题 Wear occurring at the tips of the reduction gear teeth is usually the result of （）.
单项选择题 The following preparations are essential for any （） of marine diesel engine before it may be started.
单项选择题 The diesel engine consumes considerably less fuel than the steam engine for equal output, （） enables a motor-ship to load more cargo.