设 P( A)=p, P(B)=q ,且A, B相互独立,则 P(A B)=_______。
— Do you prefer a portable or a clumsy 3D printer?
— .
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
— ___________________
— Once or twice a week.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
A rectangular area that can contain a document, program, or message.
Graphic representations for a program, type of file, or function .
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