题目内容

微型计算机与外设之间的数据传送可以采用程序控制方式、____方式和DMA方式。

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在微型计算机系统中,I/O端口可以分为数据端口,____端口和命令端口。

When the Americans sing their national anthem on formal occasions, they will sing

All of the song
B. The 1st stanza
C. The 1st and 2nd stanzas
D. The last stanza

When did Barbie Doll first appeared in public?

A. 1949
B. 1950
C. 1958
D. 1959

The USA has no national emblem.

A. 对
B. 错