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问题 选择题

下列有关反应的离子方程式正确的是（　　）

A．氯气通入冷的氢氧化钠溶液中：Cl2+2OH-=Cl-+ClO-+H2O

B．偏铝酸钠溶液与适量醋酸反应：AlO

-2
+H++H2O=Al（OH）3↓

C．氨气通入稀硫酸溶液中：2NH3+H2SO4=2NH

+4
+SO
2-4

D．向氢硫酸中通入适量氯气：S2-+Cl2=S↓+2Cl-

答案

A．氯气通入冷的氢氧化钠溶液中的离子反应为Cl2+2OH-=Cl-+ClO-+H2O，故A正确；

B．偏铝酸钠溶液与适量醋酸反应的离子反应为AlO2-+HAc+H2O=Al（OH）3↓+Ac-，故B错误；

C．氨气通入稀硫酸溶液中的离子反应为NH3+H+=NH4+，故C错误；

D．向氢硫酸中通入适量氯气的离子反应为H2S+Cl2=S↓+2Cl-+2H+，故D错误；

故选A．

多项选择题

诊断疾病的步骤包括（）

A.搜集临床资料

B.确立诊断

C.提出初步诊断

D.修正诊断

E.分析、评价、整理资料
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单项选择题

Routing protocols use different techniques for assigning ______ to individual networks. Further, each routing protocol forms a metric aggregation in a different way. Most routing protocols can use multiple paths if the paths have an equal ______ . Some routing protocols can even use multiple paths when paths have an unequal cost. In either case, load ______ can improve overall allocation of network bandwidth. When multiple paths are used, there are several ways to distribute the packets. The two most common mechanisms are per-packet load balancing and per-destination load balancing. Per-packet load balancing distributes the ______ across the possible routes in a manner proportional to the route metrics. Per-destination load balancing distributes packets across the possible routes based on ______.

A. jitter B. entity C. respond time D. cost
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