单项选择题
When using a lightning arrestor， connect which type of ground wire to a good earth ground？（）
A.#6 solid copper B.#12 solid copper C.#20 solid copper D.#22 solid copper
单项选择题 Byhowmuchisasignal’sstrengthreducedwhenthesignalpassesthroughanobjectthatintroduces3dBofattenuation？（）
单项选择题 Whatistheminimumrecommendedaccesspointoverlapforvoiceroaming？（）
单项选择题 WhichclassofCiscoaccesspointsoperateunderIEEE802.3afpower？（）
