（）的职工无特种作业操作证从事特种作业，属违章作业。
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Which wireless LAN design ensures that a mobile wireless client will not lose connectivity when moving from one access point to another?（）
A. using adapters and access points manufactured by the same company
B. overlapping the wireless cell coverage by at least 10%
C. configuring all access points to use the same channel
D. utilizing MAC address filtering to allow the client MAC address to authenticate with the surrounding AP
以下属于Ni不锈钢的钢种有（）。
A. SUSY308
B. TCBS2
C. ER309L
D. Y316L
E. 3Cr13
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