查询词典 duckbill

The advantages and disadvantages of using duckbill valve in sea outfalls are discussed in this paper, and the suitable conditions to use duckbill valve in outfall are put forward.

对排海工程中应用鸭嘴阀的利弊进行了分析，提出了鸭嘴阀在排海工程中的适用条件。

In 1843, Friedrich Engels saw an egg of a duckbill in England. People told him that it was a mammal animal from Australia. He broke into laughter after hearing it and said: All the mammal animals were vi-viparous. The duckbill was oviparous, so it could not be a mammal an-imal''.

1843年恩格斯在英国看到一只鸭嘴兽的蛋，人们告诉他，这是澳大利亚的一种哺乳动物，恩格斯听后哈哈大笑说："哺乳动物都是胎生的，鸭嘴兽是卵生的，因此肯定不是哺乳动物。"

In 1843, Friedrich Engels saw an egg of a duckbill in England. People told him that it was a mammal animal from Australia. He broke into laughter after hearing it and said:"All the mammal animals were viviparous. The duckbill was oviparous, so it could not be a mammal animal".

1843年恩格斯在英国看到一只鸭嘴兽的蛋，人们告诉他，这是澳大利亚的一种哺乳动物，恩格斯听后哈哈大笑说："哺乳动物都是胎生的，鸭嘴兽是卵生的，因此肯定不是哺乳动物。"

Second, Duckbill valve Water Pump Control Valves pros and cons: 1 advantages: Duckbill valve, low cost, such as the use of appropriate rubber material than metal valve service life, easy installation, installation of flexible and diversified ways to repair.

二、鸭嘴阀的优缺点： 1、优点：鸭嘴阀成本低，如采用合适橡胶原料使用寿命超过金属止回阀，安装方便，安装方式灵活多样，可修补。

In 1843, Friedrich Engels saw an egg of a duckbill in Engla 北美文学网 nd. People told him that it was a mammal animal from Austra 中 lia. He broke into laughter after hearing it and said:"All 说 th 北美枫44 e mammal animals were viviparous. The duckbill was oviparous, so it could not be a mammal animal".

1843年恩格斯在英国看到一只鸭嘴兽的蛋，人们告诉他，这是澳大利亚的一种哺乳动物，恩格斯听后哈哈大笑说："哺乳动物都是胎生的，鸭嘴兽是卵北美枫上生的，因此 6中肯定不是哺乳动 dj 物。"

The duckbill was oviparous, so it could not be a mammal animal.

兽'。''是卵生的，因此肯定不是哺乳动物。

The duckbill was oviparous, so it could not be a mammal an-imal''.

兽'。''是卵生的，因此肯定不是哺乳动物。

In 1843, Friedrich Engels saw an egg of a duckbill in England.

1843年恩格斯在英国看到一只鸭嘴''。

Jeff: Of course, they have strange appearances, such as duckbill,millie, and kookaburra.

杰夫：当然，它们的外貌稀奇古怪，有鸭嘴兽、针、笑翠鸟。注意，注意力集中

The duckbill platypus, it turns out, gets about eight hours of REM shuteye a day.

鸭嘴兽，每天竟然有八个小时的REM 闭眼睡眠。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。