At the beginning of the watch the current operational parameters and the condition of all machinery should be verified and also the log readings should correspond with those （）.

A、noted by the bridge officer

B、told by last duty engineer

C、observed

D、in the instruction manual

About the jacket water, that of the auxiliary engines usually（） is circulated by pumps, and the main engine usually （）

A、an engine-driven；as well

B、an engine-driven；has an independent pump

C、an independent；as well

D、an independent；has an engine-driven pump

One characteristic of a lubricating oil adversely affecting the result of centrifuging is （）

A、high TBN value

B、low oil floc point

C、low oil demulsibility

D、low oil neutralization number

Excessive lube oil consumption can result from worn or broken（）

A、piston rings

B、valve guides

C、valve seals

D、all of the above

If a diesel engine starts firing, but is unable to come up normal speed, either without load or even under a small load, the cause may be （）

A、insufficient fuel supply

B、faulty governor

C、high exhaust back pressure

D、all of the above may cause this problem

In the suction stroke, the crankshaft is rotating clockwise and the piston is moving （） the cylinderThe inlet valve is （） and a fresh charge of air is being drawn or pushed into the cylinder by the turbocharger.

A、up；opened

B、down；open

C、up；closed

D、down；closed