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单项选择题

用期落度法测定混凝土的和易性,坍落度值的大小反映拌合物的（ ）。

A.粘聚性
B.保水性
C.流动性
D.可塑性
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单项选择题
Polluting the Planet      
 
Garbage produced by people pollutes the planet. To help the planet recover, it helps to understand what effect pollution has on the environment.
      Buring fossil fuel is perhaps the greatest cause of pollution. But it is also the main means for making energy. The cheapest and surest way of providing electricity involves power plants that burn fossil fuels such as coal, which is transported to the plant using fuel also made from fossils. Burning fossil fuels causes much of the CO2 problem that contributes to climate change.
      A lot of the garbage that goes into landfill sites or is burned has to be treated first so that it doesn't send toxic chemicals into the land and the air. True, new landfills are carefully built so that these toxins don't escape, and the process of burning the garbage uses much cleaner technology than it used to. But all this requires energy, which is exactly what the world should use less of.
In developing countries, garbage may be dumped in any spare piece of land or in landfill sites that do nothing to protect the environment, or it may be burned without any thought for either nearby residents or the environment. This pollution causes health issues because it risks polluting the ground, local water sources, and the air.
Choose the correct answers.
Why are the new landfills better than the old ones?
A、They are treated first and then burned.
B、They are cleaned out regularly.
C、They don't require as much energy as the old ones did.
D、They protect the environment by not sending toxic chemicals into the ground.
单项选择题
若进行一年二氧化硫的环境质量监测，每天测12小时。每小时采样时间45分钟以上，每月测12天。在环评中这些资料可用于统计分析二氧化硫的（　　）。
A.1小时平均浓度
B.日平均浓度
C.季平均浓度
D.年平均浓度
多项选择题
融资租赁具有哪些优势？（ ）
A．承租人无需投入大量资金即可获得船舶的使用权
B．承租人可以降低船舶陈旧过时的风险
C．出租人具备获得投资回报的物质基础
D．出租人可享受投资税减免等优惠
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