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()。
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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
选择移动工具的情况下,按alt+shift键往外拖拽的含义是()。
A. 复制图像
B. 水平/垂直/45度角复制图像
C. 移动图像
D. 水平/垂直/45度角移动图像
液氨储存区和液氨蒸发区设置(),用于吸收任何情况下发生的泄漏氨气。