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【单选题】
凝固时在形核阶段,只有核胚半径等于或大于临界尺寸时成为结晶的核心,当形成的核胚半径等于临界半径时,体系的自由能变化为( ) A. 大于零 B. 等于零 C. 小于零 D. 不能确定A.
B.
C.
D.
D
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【判断题】When the operating frequency is greater than the resonant frequency, the LC parallel resonant circuit and the LC series resonant circuit are both capacitive.
A.
正确
B.
错误
【简答题】series resonant
【简答题】resonant frequency
【单选题】OBLIQUE : INDIRECT ::
A.
par : standard
B.
inherent : direct
C.
resonant : equitable
D.
justified : logical
E.
circular : animated
【单选题】What can be inferred from the passage?
A.
Twitter would like to make the word 'resonant' a popular buzzword.
B.
The ads that are resonated by most users are the best ones.
C.
Twitter's 'resonant' strategy is proved to be successful.
D.
Companies may run a risk if they pay for Twitter's ads.
【多选题】How to improve the frequency stability of the Resonant Circuit?
A.
Use the inductance and capacitance with high stability
B.
Loose coupling connection between the transistor and loop
C.
Improve the value of Q of the resonant circuit
D.
Use three point oscillator structure
【简答题】For LC parallel resonant circuit, what is the port property when it’s in resonant frequency?
【单选题】Because it is tuned a fifth lower, the viola produces a sound that is more resonant than that of the violin.
A.
more vibrant
B.
more harmonious
C.
softer
D.
sadder.
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