单项选择题

__________usually contributes to the development of all the language skills and may involve using other skills than just reading.

A.Re-reading
B.While-reading
C.Post-reading

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随机过程作为平稳过程，必须满足以下条件()

A.均值函数为常数;
B.自相关函数与无关;
C.各态历经性;
D.方差为0

下列总线中属于PC总线的为()。

A.ISA
B.STD
C.PCI
D.PC104