单项选择题
Which unit is used for measuring traffic? （）
A. Erlang
B. Bit/second
C. Hertz
D. Subscribers/kHz
E. Subscribers/minute
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What is the name of the type of fading which is due to shadowing? （）
A. Atmospheric fading
B. Multi-path fading
C. Rayleigh fading
D. Log Normal fading
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Which cell plan is designed first and is the basis for future planning?（）
A. Final
B. PQreliminary
C. Coverage
D. Initial
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C.3A事件
D.5A事件
