单项选择题 The temperature （） a liquid changes its state from liquid to gas depends upon the liquid itself and upon the pressure （） it is subjected in the containing vessel.

单项选择题 Special thrust devices are provided on ships to improve their （） at zero ship speed when the rudder is relatively ineffective.

单项选择题 The auxiliary steering gear must be capable of being brought speedily into operation and be able to put the rudder over from 15 degrees on one side to 15 degrees on the other side in no more than （） with the ship at its deepest service draught and running ahead at the greater of one half of the maximum service speed or （）.