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【单选题】
关于t检验的用途,不正确的是A.
用于两样本均数比较
B.
用于样本均数与总体均数比较
C.
用于配对样本均数比较
D.
用于两样本率比较
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举一反三
【单选题】When_________why he was late, he made no answer.
A.
questioned
B.
questioning
C.
asking questions
D.
question
【简答题】结合专题一的教学内容或者收看央视有关建国七十年辉煌成就的相关影片,围绕 “ 辉煌七十年、奋斗新时代、做新时代的奋斗者 ” 这一主题,在超星学习通上写自己的新认识、新感悟、新体会( 300 字左右)
【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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