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【简答题】
设一个装置的寿命长度当0＜t＜t 0 时，具有常数失效率C 0 ，而在t≥t 0 时，具有另一个常数失效率C 1 ，试求失效时间T的概率密度．
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【单选题】The ___ engine is used for alternators and sometimes for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.
A.
four-stroke
B.
two-stroke
C.
slow speed
D.
reversible
【单选题】At which point do you engage the main circuit breaker of the incoming alternator when paralleling two alternators?
A.
With the pointer of the synchronoscope rotating fast and both synchronizing lamps flashing on and off.
B.
In none of the mentioned alternatives.
C.
With the pointer of the synchronoscope at 12 O'clock and both synchronizing lamps dark (off).
D.
With the pointer of the synchronizer stopped at any position and both synchronizing lamps bright (on).
【简答题】常用的几种导出的逻辑运算(复合逻辑运算)为 、 、 、 、 。
【简答题】常用的几种导出的逻辑运算为 、 、 、 、 。
【单选题】You are paralleling two alternators and the pointer of the synchroscope slowly stops rotating and remains stopped in one position before the circuit breaker is closed. This would indicate ____.
A.
the synchronoscope is not functioning properly and should be checked
B.
the voltage of the incoming alternator is the same as that of the main switchboard
C.
the incoming alternator is in phase with the switchboard, but the frequency is not the same
D.
the frequency of the incoming alternator is the same as that of the main switchboard
【单选题】At which point do you engage the main circuit breaker of the incoming alternator when paralleling two alternators?
A.
With the pointer of the synchronoscope rotating fast and both synchronizing lamps flashing on and off
B.
With the pointer of the synchronoscope stopped at any position and both synchronizing lamps bright(on)
C.
With the pointer of the synchronoscope at 12 o’clock and both synchronizing lamps dark (off )
D.
None of the other alternatives
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