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【简答题】
已知某放大电路的1⁄2Au1⁄2=100,1⁄2Ai1⁄2=100,则电压增益为 dB,电流增益为 dB,功率增益为 dB。
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举一反三
【单选题】2014年3月，取得建造师资格证书的王某受聘并注册于甲公司，2015年6月工作单位变动后变更注册于乙公司，其变更后的注册有效期到（ ）止。
A.
2017年3月
B.
2017年6月
C.
2018年3月
D.
2018年6月
【单选题】The probability density function f ( x ) of a random variable X that is normally distributed is completely determined once the:
A.
mean and median of X are specified.
B.
median and mode of X are specified.
C.
mean and mode of X are specified.
D.
mean and variance of X are specified.
【单选题】Suppose a random variable X can take -1,0,1,2,3, and their corresponding probability is , , , , , then c=
A.
3
B.
2
C.
4
D.
1
【判断题】A random variable X is called symmetric about zero if for all x onthe real line, 【图片】. Suppose【图片】 is symmetric,then 【图片】.
A.
正确
B.
错误
【判断题】A random variable X is normally distributed with a mean of 150 and a variance of 36. Given that X = 120, its corresponding z -score is 5.0.
A.
正确
B.
错误
【简答题】债务重组的主要形式有哪些?
【单选题】The weighted average of the possible values that a random variable X can assume, where the weights are the probabilities of occurrence of those values, is referred to as the:( )
A.
variance.
B.
standard deviation.
C.
expected value.
D.
covariance.
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