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OTDR使用那两种原理
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【段落翻译】Remember, living green really does make our life different! It is a healthy choice both for us and for our planet. In the long run, small changes we make in our life will have a great impact on the planet. As the old saying goes, no one can do everything, but everyone can do something! With the idea of living green every single day, our Green Year is getting started.
柴油的十六烷值反映其[ ]。
以下替代燃料中，已经作为汽车发动机燃料得到广泛使用的是[ ]。
以下替代燃料中，还不能作为汽车发动机燃料，尚未得到实际使用的是[ ]。
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