1927年4月18日,南京国民政府成立,国民党所实行的是代表地主阶级、买办性的大资产阶级利益的一党专政和军事独裁统治。
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Which of the following is not the shortcomings of Analog systems? ( )
A. Consume lots of energy.
B. Not easily modified to solve new or different tasks
C. Prone to breakdowns due to their physical operation
D. Need analog-to-digital conversion.
According to Nyquist theorem, a signal with maximum frequency of W Hz must be sampled at ( )
A. W Hz
B. 0.1W Hz
C. 0.5 W Hz
D. 2W Hz
Which of the following is not the advantage to digitizing analog quantities?( )
A. Numbers are much less sensitive to physical problem
B. Numbers are easier to store than an equivalent physical amount of something.
C. Numbers can be moved through space, using electronic, optical, or acoustic means
D. Numbers are the quantities existed in physical world.
Which of the following statements about filter is not true?( )
An integrator can act as a filter.
B. The response of second order filter can be obtained by using inductance and capacitance.
C. Resistors, capacitors and amplifiers can form a second order filter.
D. Low pass filters gets the signal with higher frequency passed through.
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