停、送电制度的主要内容是什么？

下列能源不应大力开发的是（　　）

A．太阳能发电

B．风能发电

C．水能发电

D．火力发电

下列各组物质，能在pH=1的环境中形成无色溶液的是

A．Na₂SO₄ Ba(OH)₂ KCl

B．CuSO₄ NaCl KNO₃

C．K₂CO₃ KNO₃ NH₄Cl

D．MgSO₄ NaNO₃ KCl

如图为某区域模式图，读图答问题。

小题1:图中，下面关于沿③→①一线自然带及其过渡规律的描述，合理的是（   ）

A．纬度地带性显著

B．垂直地带性显著

C．自然带过渡规律：常绿阔叶林—落叶阔叶林—针叶林

D．自然带过渡规律：落叶阔叶林—草原—半草原半荒漠—荒漠小题2:关于图中各区域突出环境问题的叙述，正确的是（   ）

A．①区常绿阔叶林破坏严重

B．②区水土流失面积广大

C．③区泥石流、滑坡灾害频发

D．⑤区土壤盐渍化普遍小题3:关于图中各河流水文特征的叙述，正确的是（   ）

A．①区河流水位季节变化小

B．②区河流春汛长于夏汛

C．③区河流流速较小，有凌汛现象

D．⑥区河流汛期短，径流量季节变化小

女，55岁，高血压、冠心病患者，近日加班工作后，心前区闷痛发作频繁，伴头痛，休息后不能缓解，测血压为20/13.3kPa（150/100mmHg），心电图示R波为主导联ST-T缺血性改变，应采用何种药物治疗最为适宜（）

A.洋地黄

B.利多卡因

C.硝苯地平

D.硝酸甘油

E.硝酸异山梨酯

In November the European Parliament’s culture and education committee is due to move forward on its proposed "audiovisual media services" directive, before sending it to the full parliament in December. The new rules update and relax the "Television Without Frontiers" directive of 1989, which opened Europe’s national markets. But critics complain that they also seek to extend fusty regulations from the era of broadcast television to today’s very different technologies. Rules on advertising, the protection of children and so on could potentially also apply to all kinds of video streams, including video blogs, online games and mobile-video services.

This could have a chilling effect on innovation and risks stifling emerging technologies with rules designed for another age, says Chris Marsden of RAND Europe, a think-tank that has analysed the potential impact of the proposed rules for Ofcom, Britain’s media and telecoms regulator. "Regulators have to be thoughtful. They cannot predict the future of television "or the internet—no one can," says Niklas Zennstr. m, a co-founder of Skype, who is now setting up an internet television firm.

The proposed rules may be unrealistic as well as onerous. The idea that websites can be regulated like broadcasters, which are required to keep strict records of what they show in order to help watchdogs investigate complaints, is untenable. Firms could simply relocate outside the European Union to escape the new rules. Last week Ruth Hieronymi, a member of parliament, said she would introduce wording that might help to overcome some of the objections.

Behind the debate is the question of how best to balance competition and protection. Traditional broadcasters worry that they will be shackled by regulations while brisk start-ups can do as they please—so they like the idea of extending regulation to their new rivals. But even if the rules are approved as they stand, they will not come into force until 2010. Such a long, slow process seems incongruous given the pace of technological change.

Why Traditional broadcasters want to extend regulations to the new broadcasters ？（）

A.Because they are chained by regulations while the new rivals are free from them

B.Because it is hard to balance competition and protection.

C.Because the new broadcasters are more adapted to the regulations.

D.Because the rules come into force in a slow and long process.