Distribution layer: This layer includes LAN-based routers and layer 3 switches . When is a first-hop redundancy protocol needed in the distribution layer?（）
电气分隔（electrical separation）
Which of the following could be used to provide a Layer 3 data path between separate VLANs？（）
土壤的粒组（soil separates）
The principle of separation by which all commercially available oily water separators function is （） differential between oil and water.
QOS一般对流量的分类算法都局限在IP报文的头部，链路层（Layer 2）、网络层（layer 3）和（）
全层施肥 whole layer fertilization
A traffic separation zone is that part of a traffic separation scheme which（）.
In the 7-layer OSI model, which layer switching will take place?（）
A vessel（）a crossing vessel，shall not normally enter a separation zone or cross a separation line.
关于双频网切换（假设1800为LAYER1小区，900为LAYER2小区）以下哪个描述是错的？（）
When separating lube oil separator, the optimal separating quantity is（）of the rated quantity on name plate.
HCS结构中，一种为8个band和8个layer结构，另一种为noband和3layer结构。
To assist separation of low viscosity oils steam coils or electric heaters are fitted （） of the oily water separator.
A vessel using a traffic separation scheme shall so far as practicable（）a traffic separation line or separation zone.
38. A traffic separation zone is that part of a traffic separation scheme which ______
To separate the men from the boys means to separate the competent from those who are less competent.
A traffic separation zone is that part of a traffic separation scheme which ______.
软件设计中经常提到分层，Tier是指 分层，而Layer指 分层
SSL（Secure Sockets Layer，安全套接层)，及其继任者传输层安全（Transport Layer Security，TL
作物生长后期常用的施肥方法是_______ 。 A.开沟条施 B.集中施肥 C.叶面喷施 D.分层施肥
Together with the network layer,the transport layer is the heart of the protocol （）.The network layer provides end-to-end （） delivery using datagrams or virtual circuits.The transport layer builds on
