The process during which liquid containing a reasonable amount of sensible heat at a particular pressure immediately changes into steam after admitted to a chamber at a lower pressure is called _____.

If it becomes necessary for a stand-on vessel to take action to avoid collision，she shall NOT，if possible，().

To reduce the weight of the reciprocating parts, pistons of high-speed engines are made considerably shorterThis results in __________.

If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below, the accumulation of flammable mixture would be ignited, thus resulting in _____.

Brushless generators are designed to operate without the use of_____.

The sealing rings are in four parts and pressed together around the piston rods by means of _____