A moving object will not accelerate or decelerate （）a force is applied to it.

A、whether

B、if

C、unless

D、till

If you notice smoke coming fro the crankcase exhaust fan outlet of an operating diesel engine, you would suspect（）

A、a cracked cylinder liner

B、clogged intake ports

C、broken piston rings

D、a faulty head gasket

An oxygen indicator will detect （）.

A、the amount of oxygen in a space

B、the presence of harmful amounts of carbon monoxide

C、concentrations of explosive gas

D、All of the above

Inductance is the property of an electric circuit that （）

A、opposes any change in the applied voltage

B、opposes any change in the current flow through the circuit

C、aids any changes in the applied voltage

D、aids any changes in the current through the circuit

If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）

A、a broken shaft on the freshwater pump

B、an excessive accumulation of scale exchanger

C、an incorrect thermostatic element operating range

D、lube oil in the cooling water

On a multistage flash-type evaporator, the flash chamber is （）

A、combined as part of the salt water feed heater

B、the open area above the brine levels in the first and second stages

C、combined as part of the distillate cooler

D、another term used to describe the vapor feed heater