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What is the concern of ordinary people about the "Greenhouse Effect"？
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氨渗漏试验是将含氨()(体积分数)的压缩空气通人容器内，并在焊缝及连接部位贴上比焊缝宽20mm的试纸。
在Excel中排序时如果选择多个关键宇段，则所有关键字段必须选用相同的排序顺序 (如递增或递减)。 ()
听力原文： This is your local weather update with meteorologist Chris Lee. We can look forward to a beautiful evening, with warm temperatures and a lovely sunset. Sunset will occur at 8:30, and the beach is the perfect place to watch it. It's better to stay on shore, though. There is a fog warning out for small boats tonight. A light fog will roll in just after sunset and stay with us all night. The sun rises tomorrow morning at 5:45. Light winds in the morning will blow the fog out to sea, so we'll enjoy sunshine and more warm temperatures tomorrow afternoon. Take advantage of the nice weather now because rain is predicted for later in the week.
What time will the sun set tonight？
听力原文：Woman: I think we've got the transportation plan worked out. We have four buses to take people from the hotel to the convention center. That should be enough, don't you think？
Man: Yes, I think so. It takes five minutes to load one bus and ten minutes to make the trip, so we could plan to have one bus leave every fifteen minutes.
Woman: That sounds like a good schedule. Each bus could make the round trip in thirty minutes, and no one would have to wait too long for a ride. Then we won't have to worry about anybody's ruffled feelings.
How many buses are there？
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