空白支票应视同现金进行保管。

GPRS点对点面向连接的网络业务属于虚电路型业务，它为两个用户之间传送多路数据分组建立（），它要求有建立连接、数据传送和连接释放的过程。

身体的摆动是顶球力量的主要来源。

Fate has not been kind to the western grey whale. Its numbers have dwindled to 130 or so, leaving it “critically endangered” in the eyes of the International Union for the Conservation of Nature. Fishing-nets, speeding ships, pollution and coastal development threaten the few that remain. Most recently, drilling for oil and gas in their main summer feeding grounds, near Sakhalin island off Russia’s Pacific coast, has brought fresh risks for the luckless creatures. Yet the rush to develop Sakhalin’s offshore fields may yet be the saviour of the species.

When drilling was first discussed in the 1990s, there were muted complaints. When a consortium called Sakhalin. Energy, led by Royal Dutch Shell, announced plans to build an oil platform and lay pipelines in the only bay where the whales were known to congregate, these protests proliferated.

In response, the consortium established an independent panel to advise it on how best to protect the whales and promised to fund its work. It subsequently agreed to change the route of the pipeline at the panel’s suggestion, although it refused to move the platform, as other critics had demanded. It also agreed either to follow the panel’s recommendations in future or to explain publicly why it was rejecting them.

The platforms and pipelines are now complete. Sakhalin Energy exported its first cargo of liquefied natural gas last week. The project, says Shell, is an engineering triumph and a commercial success despite all the controversy.

But has it been a success for the whales Sakhalin Energy says their number seems to be growing by 2.5% a year, although Ian Craig, the firm’s boss, admits that the cause might be greater scrutiny rather than population growth. The scientists on the panel still seem worried. They complain that the firm has not always provided the information they need to assess the threat to the whales. It also has not always followed advice, the scientists’ advice about how noisy construction might scare the animals away, for example, or the speed that boats should travel to minimize the risk of hitting the whales. The scientists warn that the loss of just a few fertile females would be enough to tip the population into irrevocable decline. Last summer, there seemed to be far fewer whales around than normal.

On the other hand, the panel knows this only because Sakhalin Energy funds lots of research on the whales. As a result, it has discovered that they have a wider range than originally thought, which might explain why so few of them showed up off Sakhalin island last year.

Therefore, it is hard to escape the conclusion that, for creatures with a lot as sorry as the western grey whale, a nearby oil project is something of a blessing.

An appropriate title for the passage is most likely to be（）

A. More Efforts Needed to Protect the Endangered Whales

B. The Environmental Risks and Rewards of Offshore Oil

C. The Already Endangered Whales Still in Danger

D. More Offshore Oil Projects, More Chances for Whales

对于12500产品的IRF2特性，下面哪些说法正确（）。

A.目前S12500支持2台设备虚拟化，2011年Q3可以支持4台虚拟化

B.通过虚拟化特性，在数据中心中可以组件更大规模的二层网络，满足虚拟机迁移的要求

C.S12500产品从2009年推出IRF2特性，目前网络运行已经超过2年时间，其稳定性、可靠性经过了市场的实际检验

D.12500产品虚拟化特性和友商相比，还可以提供技术专利、用户使用报告、第三方测试报告等

当债务人要求提前履行债务时，债权人（）。

A.可以拒绝

B.不可拒绝

C.可要求债务人赔偿损失

D.不需事先通知