单词:non return flap valve
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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.
Lesson 94 A Pair Of Bellows 第94课 一副风箱 Have you a pair of bellows at home? 你的家里是否有一副风箱呢? If you have, I hope that you will examine them carefully, and try to see how they are made, and to understand their use. 如果有
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今天我们要学的词是flap。 Flap在口语里,有争议、危机的意思。不久前,很多人莫名其妙地收到白宫的电子邮件,宣传奥巴马的医疗保健改革。The White House decided to make changes to its e-mail sign up
今天我们要学的词是flap。 Flap在口语里,有争议、危机的意思。不久前,很多人莫名其妙地收到白宫的电子邮件,宣传奥巴马的医疗保健改革。The White House decided to make changes to its e-mail signup