列写节点方程，图示部分电路BC间互导应为下列（）。 A．2S B．-14S C．3S

（10分）A、B、C、 D四种溶液分别是NaOH溶液、氨水、 CH₃COOH溶液、盐酸中的一种。常温下：

①浓度均为0.1mol·L^－1的A和C溶液，pH：A＜C＜7；

②将1 L pH=3的A溶液分别与0.001mol·L^－1 xL B溶液、0.001mol·L^－1  yL D溶液充分反应至中性，x、y大小关系为： y＜x；

回答下列问题：

（1）D是                      （填化学式）溶液;                                                      

（2）②中1LpH=3的A溶液与0.001mol·L^－1 xL B溶液充分反应至中性，所得溶液中各种离子的物质的量浓度由大到小的顺序为                                  。

（3）常温下，等体积且等物质的量浓度的C溶液和D溶液充分混合后所得溶液的pH

       7（填“＞”、“＜”或“=”），用离子方程式解释其原因                。

（4）向pH相同且等体积的两份溶液A和C中，分别投入质量不同的锌粉反应，若放出氢气的质量相同，则下列说法正确的是                  （填写序号）。

①开始反应时的速率A>C                ②反应所需要的时间C>A 

③参加反应的锌粉物质的量A="C          " ④A溶液里有锌粉剩余

比较运动快慢的方法有：①比较相同时间内通过的路程；②比较通过相同路程所用的时间．我们在观看长跑比赛时，认为跑在前面的运动员快些，这是采用上述第______种方法；而裁判员认定，到达终点用时间少的运动员跑得快些，这是采用上述第______种方法．（填写序号）

双氧水

联入Internet的计算机必须遵从的通信协议是（）。

A.FTP

B.DNS

C. HCH/PP

D. TCP/IP

(D)

Consumers are being confused and misled by the hodge-podge of environmental claims made by household products, according to a "green labeling" study published by Consumers International Friday.

Among the report’s more outrageous findings-a German fertilizer described itself as "earthworm friendly" a brand of flour said it was "non-polluting" and a British toilet paper claimed to be "environmentally friendlier".

The study was written and researched by Britain’s National Consumer Council (NCC) for lobby group Consumer International. It was funded by the German and Dutch governments and the European Commission.

"While many good and useful claims are being made, it is clear there is a long way to go in ensuring shoppers are adequately informed about the environmental impact of products they buy." said Consumers International director Anna Fielder.

The 10-country study surveyed product packaging in Britain, Western Europe, Scandinavia and the United States. It found that products sold in Germany and the United Kingdom made the most environmental claims on average.

The report focused on claims made by specific products, such as detergent insect sprays and by some garden products. It did not test the claims, but compared them to labeling guidelines set by the International Standards Organization (ISO) in September, 1999.

Researchers documented claims of environmental friendliness made by about 2,000 products and found many too vague or too misleading to meet ISO standards.

"Many products had specially-designed labels to make them seem environmentally friendly, but in fact many of these symbols mean nothing." said report researcher Philip Page.

"Laundry detergents made the most number of claims with 158. Household cleaners were second with 145 separate claims, while paints were third on our list with 73. The high numbers show how very confusing it must be for consumers to sort the true from the misleading." he said.

The ISO labeling standards ban vague or misleading claims on product packaging, because terms such as "environmentally friendly" and "non-polluting" can not be verified. "What we are now pushing for is to have multinational corporations meet the standards set by the ISO." said Page.

What is one of the consequences caused by the many claims of household products（）

A. They are likely to lead to serious environmental problems.

B. Consumers find it difficult to tell the true from the false.

C. They could arouse widespread anger among consumer.

D. Consumers will be tempted to buy products they don’t need.