[化] 吸滤器; 吸入管过滤器

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Part 13 Ballast handling 1. Scuppers plugged. 2. Open sea suction valve and report. 3. Sea suction valve closed. 4. Ballast pump stopped.

发表于:2018-12-05 / 阅读(218) / 评论(0)

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发表于:2018-12-26 / 阅读(153) / 评论(0)

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发表于:2018-12-27 / 阅读(226) / 评论(0)

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英语听力训练连载 listen 30

DIALOG 30 THE HUMAN FLY 1--Did you hear about that guy who climbed a skyscraper? 2--I don't believe I did. Was it on the TV news last night? 1--Uh-huh. This guy-calls himself

发表于:2018-12-27 / 阅读(147) / 评论(0)

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发表于:2018-12-27 / 阅读(132) / 评论(0)

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发表于:2019-01-02 / 阅读(222) / 评论(0)

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Fish Use Whole Bodies When They Eat Fish are animals that live in the water. They are also vertebrates animals that have a backbone and a spine. They have gills that permit them to take oxygen from the water. But have you ever wondered how vertebrate

发表于:2019-01-12 / 阅读(142) / 评论(0)

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What Are Those Marks on the Olympic Athletes?

AS IT IS 2016-08-10 What Are Those Marks on the Olympic Athletes? American swimmer Michael Phelps has won more Olympic medals than anyone in history. On Sunday night, he added another gold medal as a member of the USA 4x100-meter freestyle relay team

发表于:2019-01-12 / 阅读(216) / 评论(0)

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发表于:2019-01-19 / 阅读(172) / 评论(0)

VOA双语新闻 2015年7月

趣味青春英语电台第257期:Put the pedal to the metal

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发表于:2019-02-06 / 阅读(178) / 评论(0)

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发表于:2019-02-16 / 阅读(212) / 评论(0)

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action for reimbursement

afc(automatic frequency control)

arundinaria giganteas