在环己烯制备实验中,为什么控制分馏柱顶温度低于73℃,可以将生成的环己烯完全蒸馏出来?
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地理信息系统GIS主要包括三维、时态和网格3种,其中()GIS更加实用化,可以支持辅助决策。
A. 三维
B. 时态
C. 网格
D. 以上全部
在海德的平衡理论中,P是指()。
A. 对象
B. 他人
C. 个体
D. 关系
If the router R1 has a packet with a destination address 192.168.1.255, what describes the operation of the network()。
A. R1 will forward the packet out all interfaces.
B. R1 will drop this packet because this it is not a valid IP address.
C. As R1 forwards the frame containing this packet, Sw-A will add 192.168.1.255 to its MAC table.
D. R1 will encapsulate the packet in a frame with a destination MAC address of FF-FF-FF-FF-FF-FF
E. As R1 forwards the frame containing this packet, Sw-A will forward it to the device assigned the IP address of 192.168.1.255.