[单选题]Early stern-tube bearing used bearing materials such as lignum vitae which were lubricated by ______.
[单选题]Combustible material stored in a compartment adjacent to a compartment where there is a fire may be ignited. This ignition can occur by _____.
[单选题]Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?
[单选题]Nowadays, there are two kinds of propeller on board ship, one is fixed pitch propeller, the other is the______pitch propeller.
[单选题]The piston cooling system may employ similar components, except that _____is used instead of a head tank.
[单选题]The open loop control system is one in which the control action is______, that is the output in no way controls the system.
[单选题]In the part of the cylinder liner inside the scavenging air box there are a series of openings known as _____ .
[单选题]During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to reversing the engine rotation?
[单选题]During the watch keeping at sea, at appropriate intervals inspection should be made of _____ , auxiliary machinery and steering gear spaces by the duty engineer.