手摇道岔流程手摇道岔作业应遵循“一看、二扳、三确认、四显示”的作业流程。
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手机银行是通过手机为客户提供服务。
A. 正确
B. 错误
按传统养殖地区不同、血统不同和瘦肉脂肪比率不同三种分类方法分类的是（）。
A. 牛类
B. 猪类
C. 鸡类
D. 鸭类
For what two purposes does the Ethernet protocol use physical addresses?（）
A. to uniquely identify devices at Layer 2
B. to allow communication with devices on a different network
C. to differentiate a Layer 2 frame from a Layer 3 packet
D. to establish a priority system to determine which device gets to transmit first
E. to allow communication between different devices on the same network
F. to allow detection of a remote device when its physical address is unknow
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