單項(xiàng)選擇題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.

A.at which/to which
B.from which/at which
C.to which/from which
D.in which/on which


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1.單項(xiàng)選擇題Special thrust devices are provided on ships to improve their () at zero ship speed when the rudder is relatively ineffective.

A.brake capabilities
B.reversing capabilities
C.maneuvering capabilities
D.acceleration capabilities

4.單項(xiàng)選擇題Which of the following chemicals will be used where protection against caustic cracking is required in boiler treatment?()

A.Sodium hydroxide
B.Sodium carbonate
C.Sodium nitrate
D.Sodium polyphosphate