A.periodically
B.occasionally
C.chronologically
D.additionally
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A.at which/to which
B.from which/at which
C.to which/from which
D.in which/on which
A.brake capabilities
B.reversing capabilities
C.maneuvering capabilities
D.acceleration capabilities
A.28 seconds；7 knots
B.28 seconds；14 knots
C.60 seconds；7 knots
D.60 seconds；14 knots
A.more than 28 seconds
B.more than 60 seconds
C.less than 28 seconds
D.less than 60 seconds
A.Sodium hydroxide
B.Sodium carbonate
C.Sodium nitrate
D.Sodium polyphosphate
最新試題
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
A grease gun is generally used to lubricate a （）.
Which of the listed pumps is NOT a positive displacement pump?（）
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
The output volume of a positive fixed displacement pump can be changed only by （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
A salinity indicator is used to determine the （）.