题目内容

Listen to the following transmissions and fill in the blank with missing words.We are stopping. The _______________is still guiding us in, but Ithink my engine will hit the boarding bridgeif we taxi any further.

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Listen to the following transmissions and fill in the blank with missing words.Request a remote apronfor parking our aircraft due ______

设二维随机变量(X,Y)在区域D={(x,y)|0

A. 1/2;0.5
B. 0
C. 1
D. 1/3

随机变量X的方差是X的2阶中心矩.

A. 对
B. 错

若C为常数,则D(C)=0.

A. 对
B. 错

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