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【单选题】
带比例调节器的单闭环直流调速系统中,放大器的KP越大,系统的( )。 A.静态.动态特性越好 B.动态特性越好 C.静态特性越好 D.静态特性越坏A.
B.
C.
D.
D
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举一反三
【单选题】Multiple selection problem (one option) For the circuit, if the frequency of the excitation is f=100Hz, it is( ); if the frequency of the excitation is f=200Hz.
A.
resistive, inductive
B.
capactive, inductive
C.
capactive, resistive
【多选题】When two tuning forks are sounded at the same time, a beat frequency of 5 Hz occurs. If one of the tuning forks has a frequency of 245 Hz,the frequency of the other tuning fork is .
A.
260 Hz
B.
250 Hz
C.
240 Hz
D.
235 Hz
【单选题】When paralleling two AC generators, the frequency of the machine coming on-line, immediately prior to closing its breaker, should be _____.
A.
slightly less than the oncoming generator frequency
B.
the same as the bus frequency
C.
slightly greater than the bus frequency
D.
the same as the bus voltage
【多选题】当今世界正在经历百年未有之大变局，五四以来的一百年是（）
A.
是中华民族伟大复兴取得一个又一个伟大胜利的一百年
B.
是马克思主义传入中国并从根本上改变中国命运的一百年
C.
是我国从东亚病夫到日益走近世界舞台中央的一百年
D.
是中国共产党从一个50多人的小党成长壮大为世界第一大党的一百年
【单选题】Suppose that in a population the frequency of a particular recessive condition is 1/400. Assume the presence of only a dominant allele (A) and a recessive allele (a) in the population and that the pop...
A.
0.000625
B.
0.0025
C.
0.025
D.
0.05
E.
0.95
【简答题】In FM the frequency of the carrier wave is varied within a fixed range at a rate corresponding to the frequency of a sound signal.
【简答题】对两个事物或现象进行阴阳属性划分，是有一定原则的。这是下列哪项的内涵?() A阴阳的相关性 B阴阳属性的规定性 C阴阳的相对性 D阴阳的可分性
【单选题】As a result, the system will vibrate at the frequency of the _____ force regardless of the initial conditions or natural frequency of the system.
A.
action
B.
excitation
C.
out
D.
act
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