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

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

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

A、piston rings

B、valve guides

C、valve seals

D、all of the above

On an electro-hydraulic steering gear, which of the listed devices will keep the rudder from over-traveling the bridge signal?（）

A、Rudder angle indicator

B、Follow-up gear

C、Electric transmitter

D、Rudder angle limit switch

（）is put into use in the late years to maintain a preset tension in a mooring line after a ship has been tied up at a pier.

A、The large-tension mooring

B、The small-tension mooring

C、The variable-tension mooring

D、The constant-tension mooring

Why is it important for fuel oil tanks not to be topped off at the inner bottom level when loading on a cold day?（）

A、Increased viscosity of the product needs higher loading pressure, which increases the chances of a spill

B、Air pockets may cause the fuel to bubble out of the ullage hole

C、The temperature rise of the fuel will cause an overflow

D、Fueling valve may become stuck closed and cause the fuel oil to spill before the valve can be opened