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【简答题】
Can you speak either English or French?(英译汉)
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【简答题】Voltage source inverters (VSIs) are named so because the independently controlled output is a voltage waveform. Similarly ,current source inverters (CSIs) are distinct in that the controlled AC output...
【单选题】The DGS8800e digital governing system used in AC-4 main engine control system is ______.
A.
a fully digital governor controlled by MPU
B.
a hydraulic governor assisted by MPU
C.
only suitable for fixed speed diesel
D.
a modularized governor with field bus connection
【单选题】The division of the kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the （）.
A.
voltage regulators
B.
field rheostats
C.
reverse power relays
D.
prime mover governors
【简答题】请对我国运动训练管理运作方式进行论述。
【单选题】In an AC synchronous motor electric propulsion plant, propeller speed is controlled by varying the ___ .
A.
prime mover speed
B.
number of energized main motor poles
C.
propulsion generator field strength
D.
electric coupling field strength
【单选题】The AC to controlled-DC conversion is accomplished in line-frequency phase-controlled converters by means of ( )
A.
magnetic field
B.
transformer
C.
resistors
D.
thyristors
【单选题】Birds are literally half-asleep-with one brain hemisphere alert and the other sleeping, according to a new study of sleeping ducks. Earlier studies have documented half-brain sleep in a wide range of ...
A.
half-brain sleep is found in all kinds of birds
B.
half-brain sleep is characterized by accelerated brain waves
C.
birds can control their half-brain sleep consciously
D.
birds always sleep with the whole of their brain at rest
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