芯给式滑油器

VOA慢速英语2012 Agriculture Report - Feed the Soil, Feed the Crops

Agriculture Report - Feed the Soil, Feed the Crops This is the VOA Special English Agriculture Report. Studies show farmland in Africa is often lacking in important nutrients. But researchers say a combination of farming methods may help. Since the w

发表于:2019-01-12 / 阅读(65) / 评论(0)

2012年VOA慢速英语(九)月

VOA标准英语--Feed the Soil, Feed the Crops

Feed the Soil, Feed the Crops If African farmers are going to feed the continent, they may first want to feed the soil. Studies show farmland is often depleted of vital nutrients. But researchers say a combination of organic farming methods may help.

发表于:2019-01-13 / 阅读(66) / 评论(0)

VOA标准英语2012年(九月)

科学美国人60秒 SSS Feed Microbes Oxygen to Help Clear Spilled Oil

On June 3rd, a train loaded with highly volatile crude oil derailed just outside the small town of Mosier in Oregons Columbia River Valley. More than 40,000 gallons of crude spilled out of the train. Some burned away in a 14-hour long fire at the sce

发表于:2019-01-17 / 阅读(74) / 评论(0)

2016年Scientific American(十)月

牛津少儿英语 let's chant 51 - Big Box, Little Box (solo) - 29 s.

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发表于:2019-01-28 / 阅读(75) / 评论(0)

Let's chant Let's sing

牛津少儿英语 let's chant 52 - Big Box, Little Box (group) - 25 s.

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发表于:2019-01-28 / 阅读(81) / 评论(0)

Let's chant Let's sing

能源行业英语-1 热点石油资源 Oil Resources

Scene 1 Topic 1 Oil Resources Key Sentences： 1. I do agree with you more. 2. Maybe I'm not able to answer all the questions, but I'm happy to try. 3. I'm honored to interview you. 4. Petroleum, coal, natural gas are major chemical feed stock. 5. Co

发表于:2019-02-06 / 阅读(109) / 评论(0)

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aluminum hydroxyacetate