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【单选题】
维生素b6缺乏产生的贫血症为( )。A.
巨幼红细胞性贫血
B.
小细胞性贫血
C.
溶血性贫血
D.
恶性贫血
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反馈参考答案：
举一反三
【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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