单项选择题
The Cisco Aironet 1140 Series Access Point draws 12.95 W at the power source. However， whenusing a long Ethernet cable， the device can draw up to how much additional wattage？（）
A.0.25 W
B.0.45 W
C.1 W
D.1.25 W
E.2.45 W
F.5.65 W
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Whenusingalightningarrestor，connectwhichtypeofgroundwiretoagoodearthground？（）
A.#6 solid copper
B.#12 solid copper
C.#20 solid copper
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Byhowmuchisasignal’sstrengthreducedwhenthesignalpassesthroughanobjectthatintroduces3dBofattenuation？（）
A.1/6
B.1/4
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Whatistheminimumrecommendedaccesspointoverlapforvoiceroaming？（）
A.less than 10 percent
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D.25 to 30 percent
