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【多选题】
关于方差的性质，下列说法正确的是A.
设 C 是常数， X 是随机变量，则D(CX)=C D(X)
B.
设 C 是常数， X 是随机变量,则 D(C+X)=C+D(X)
C.
若 X,Y 为独立随机变量，则 D(X+Y)=D(X)+D(Y)
D.
若 X,Y 为独立随机变量，则 D(X-Y)=D(X)-D(Y)
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举一反三
【简答题】A．selective B．captive C．optional D．alternative
【单选题】Which is NOT true about alternative forms of energy?
A.
Gas is form of alternative energy
B.
Alternative forms of energy are clean
C.
Nuclear technology started to develop 8 decade ago
【简答题】选择性剪接(alternative splicing)
【单选题】Which is not true about alternative forms of energy?
A.
Gas is a form of alternative energy.
B.
Alternative forms of energy are clean.
C.
Nuclear technology started to develop 8 decades ago.
【简答题】以太网数据帧的最小长度为()，最大长度为()
【判断题】Internet advertising, once seen as the mainstay of media advertising, is facing numerous challenges from alternative media, especially interactive and social media.
A.
正确
B.
错误
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