读我国东北地区某河流流量补给示意图，回答题。

小题1:图中数码表示雨水补给和季节性融雪补给类型的分别是（    ）

A．①、②

B．②、③

C．③、②

D．③、①小题2:与淮河相比，该河流水文特征是（   ）

A．水位季节变化小

B．泥沙含量大

C．有明显的春汛和夏汛

D．冬季封冻断流

The metric assigned to each network depends on the type of protocol. Some simple protocol, like RIP, treats each network as equals. The （71） of passing through each network is the same; it is one （72） count. So if a packet passes through 10 network to reach the destination, the total cost is 10 hop counts. Other protocols, such as OSPF, allow the administrator to assign a cost for passing through a network based on the type of service required. A （73） through a network can have different costs (metrics). For example, if maximum （74） is the desired type of service, a satellite link has a lower metric than a fiber-optic line. On the other hand, if minimum （75） is the desired type of service, a fiber-optic line has a lower metric than a satellite line. OSPF allow each router to have several routing table based on the required type of service.

72（）

A．process

B．hop

C．route

D．flow