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【判断题】
电机在正常运行时,如闻到焦臭味,则说明电动机速度过.。A.
正确
B.
错误
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【简答题】Class AB power amplifiers are introduced to overcome ( ) distortion.
【单选题】Electrical engineers have repeatedly demonstrated that the best solid-state amplifiers are indistinguishable from the best vacuum-tube amplifiers with respect to the characteristics commonly measured ...
A.
Many people cannot tell from listening to it whether a recording is being played with a very good solid-state amplifier or a very good vacuum-tube amplifier.
B.
The range of variation with respect to the quality of musical reproduction is greater for vacuum-tube amplifiers than for solid-state amplifiers.
C.
Some of the characteristics that are important in determining how music sounds to a listener cannot be measured.
D.
Solid-state amplifiers are more compact, use less power, and generate less heat than vacuum-tube amplifiers that produce a comparable volume of sound.
E.
Some vacuum-tube amplifiers are clearly superior to some solid-state amplifiers with respect to the characteristics commonly measured in the laboratory to evaluate the quality of an amplifier’s musical reproduction.
【简答题】自己住家说(),初次见面说“久仰”,长期未见说“久违”。
【简答题】5-85. 初次见面说___,长期未见说___。(两个答案之间用全角符号“,”隔开)
【多选题】Which of the following are false statements regarding cross-field amplifiers (CFAs)?
A.
CFAs tend to have significant gain compared with other tube types.
B.
CFAs are characterized by relatively high additive phase noise.
C.
CFAs suffer from inherently narrow bandwidth capability.
D.
For a given amount of average output power, the CFA more cost-effective than Klystron.
【简答题】自己住家说“寒舍”,初次见面说“______”,长期未见说“________”。
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