题目内容

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。

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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

喷雾干燥设备的心脏是。