Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinderIf the cooling water temperature from all cylinders begins to rise above normal, you should suspect （）
A、increase blow-by in all cylinders
B、incomplete combustion in all cylinder
C、overloading in all cylinders
D、insufficient fuel delivery to all cylinders
Most conducting materials such as copper, aluminum, iron, nickel, and tungsten （）.
A、increase in resistance with increased temperature
B、increase in resistance with decreased temperature
C、decrease in resistance with increased temperature
D、increase in conductance with increased temperature
To safeguard the operator and other personnel working on or near a hoisting operation which of the following precautions should be observed?（）
A、Keep a load on the hoist until all personnel are finished working
B、Set the load on a movable dolly when transportation may be needed
C、Have one man keep a hand on the load to steady it
D、Insure that the lifting gear capacity is not exceeded
When oily water separator is operating, which measure （） is wrong.
A、pay attention to operating parameters
B、renew and clean separating units in time
C、check oil level in separator to prevent overload
D、check separating effect, if it is bad, flush with large capacity water pump
Most marine biological sewage treatment plants consist of all the following statements except （）.
A、aeration tanks
B、settling tanks
C、disinfection agent
D、anaerobic bacteria
The average pressure exerted on piston during each power stroke is termed（）
A、indicated horsepower
B、mean effective pressure
C、exhaust back pressure
D、compression pressure
