●The two goals of an operation system are（71）and efficiency. （71）A.convenience B.quick C.o

What determines the number of events occurring in a cycle of operation in an internal combustion engine？

The selection of an oil depends _____ on the operating conditions, the design of the engine and the type of fuel to be burned.

The purpose of an after－cooler is to_____.A.reduce the turbocharger operating temperatureB

The division of the kilowatt load between two AC generators operating in parallel is contr

The operation of paralleling two alternators requires（) to be equal and also in phaseA.th

Dozens of scientific groups all over the world have been ______ the goal of a practical an