A.Because she had to type Mr. Bacomb's speech.
B.Because she had to meet some businessmen.
C.Because she had a headache.
D.Because she had to get her car fixed.
第3题
以下哪一个不是无线局域网IEEE 802.11规定的物理层传输方式?()
A)直接序列扩频
B)跳频扩频
C)蓝牙
D)红外
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