更多“广播电视有哪几类经营体制？”相关的问题
Global warming may or may not be the great environmental crisis of the 21st century, but—regardless of whether it is or isn’t—we won’t do much about it. We will argue over it and may even, as a nation, make some fairly solemn-sounding commitments to avoid it. But the more dramatic and meaningful these commitments seem, the less likely they are to be observed. A1 Gore calls global warming an "inconvenient truth," as if merely recognizing it could put us on a path to a solution. But the real truth is that we don’t know enough to relieve global warming, and—without major technological breakthroughs—we can’t do much about it. From 2003 to 2050, the world’s population is projected to grow from 6.4 billion to 9.1 billion, a 42% increase. If energy use per person and technology remain the same, total energy use and greenhouse gas emissions (mainly, CO2) will be 42% higher in 2050. But that’s too low, because societies that grow richer use more energy. We need economic growth unless we condemn the world’s poor to their present poverty and freeze everyone else’s living standards. With modest growth, energy use and greenhouse emissions more than double by 2050. No government will adopt rigid restrictions on economic growth and personal freedom (limits on electricity usage, driving and travel) that might cut back global warming. Still, politicians want to show they’re "doing something." Consider the Kyoto Protoco(京都议定书). It allowed countries that joined to punish those that didn’t. But it hasn’t reduced CO2 emissions(up about 25% since 1990), and many signatories(签字国) didn’t adopt tough enough policies to hit their 2008—2012 targets. The practical conclusion is that if global warming is a potential disaster, the only solution is new technology. Only an aggressive research and development program might find ways of breaking our dependence on fossil fuels or dealing with it. The trouble with the global warming debate is that it has become a moral problem when it’s really an engineering one. The inconvenient truth is that if we don’t solve the engineering problem, we’re helpless.
A.It may not prove an environmental crisis at all.B.It is an issue requiring worldwide commitments.C.Serious steps have been taken to avoid or stop it.D.Very little will be done to bring it under control.
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焦炭的灰分增加（）。
A . A.焦比升高
B . B.焦比下降
C . C.焦炭强度升高
D . D.焦炭含硫增加
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处理高压设备，应首先断开电源，并有可见的断电间隔：不做短路接地，不装临时接地线。
A . 正确
B . 错误
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The exhaust valve opens before bottom dead center in a four stroke engine to（） Ⅰ.allow for blow down Ⅱ.Reduce pumping losses
A.Ⅰ only B.Ⅱ only C.both Ⅰ and Ⅱ D.neither Ⅰ nor Ⅱ
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钢筋砼预制桩的运输和堆放应满足以下要求（）
A.砼强度达到设计强度的70%以上方可运输
B.砼强度达到设计强度的100%方可运输
C.堆放层不宜超过10层
D.不同规格的桩按上小下大堆放
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不符合渗出液者为（ ）。
A.穿刺液自凝 B.呈现不同颜色或混浊 C.比重>1.018 D.Rivalta试验（－） E.细胞数>500×106/L
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The boy goes to school on foot every day.（）
A.选项A
B.选项B
C.选项C
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全部严格执行新冠肺炎筛查流程的是（）
A.所有来院的发热病人
B.所有来院病人
C.本地普通病人
D.来医院的所有人
E.急诊病人
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与M0型急性髓细胞性白血病在形态学上类似的是（）
A.M2a B.M4 C.MDS D.ALL-L2 E.ALL-L3
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下图为某同学构建的晴朗白天植物有氧呼吸过程图，下列正确的是（）
下图为某同学构建的晴朗白天植物有氧呼吸过程图，下列正确的是（）
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Synchronically, the basic meaning of a word is considered to be the core of word meaning, called the _______ meaning.
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