In network architecture, service is a “vertical” concept()
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In network architecture, the place where adjacent layers interact is called service access point(SAP)()
In TCP/IP architecture, the PDU in network layer is()
A. bit
B. frame
C. packet
D. character
下列不属于危险化学品的是()
A:汽油、易燃液体
B:放射性物品
C:氧化剂、有机过氧化物、剧毒药品和感染性物品
D:氯化钾
Frame is encapsulated in packet in communication network architecture()