The gas extraction effects is related to negative pressure of suction.
顶板瓦斯高抽巷的抽采效果与抽放负压直接相关。
How it works: the piston moves from left to right, form a negative pressure pump cylinder, then the suction tank fluid through the valve into the pump cylinder.
工作原理：活塞自左向右移动时，泵缸内形成负压，则贮槽内液体经吸入阀进入泵缸内。
Objective: To study clinical importance of casting pile-core crown with negative pressure suction silastic impressions and analyze reasons for the failure of routine impressions in pile-core crown.
目的：探讨铸造桩核冠常规印模过程中失败的原因，研究负压抽吸硅橡胶印模应用于铸造桩核冠的临床意义。
An animal experiment and clinical investigations have been done to choose a suitable negative pressure of closed suction drainage of the peritoneal cavity.
在动物实验和临床观察基础上，探讨腹腔负压引流适宜的负压值。
This paper gives some new idea about an experiment of separating epidermis by suction with heating and negative pressure.
本文介绍了对人体皮肤施以负压和加温，进行表皮分离的实验及所得到的新的认识。
The exhaust vents were moved backward to take advantage of the negative pressure suction caused by the built in spoiler.
在排气口被转移落后利用负压吸造成的优势，内置的破坏者。
And abortion is the negative pressure pipe in the womb, the use of negative pressure suction to pregnancy product.
而人工流产是将负压管放进宫腔内，利用负压吸去妊娠产物。
Full use of its bearing capacity of the tank to reduce the oil vapor emissions, the principle is to use the weight of the valve plate to control the breath pressure and suction tank negative pressure.
充分利用油罐本身的承压能力来减少油蒸气排放，其原理是利用阀盘的重量来控制油罐的呼气正压和吸气负压。
The utility model discloses a negative pressure generator used by a water pump suction pipe without a bottom valve.
本实用新型公开了一种无底阀水泵吸水管用负压发生器。
The utility model provides an odour discharging device of a toilet bowl, which belongs to the technology of negative-pressure odour suction and water sealing.
本实用新型是提供一种坐便器排臭装置，是一种负压吸气排臭和水封技术。
A general suction pot for cupping is not easily lifted down, and the negative pressure in the pot is not easily regulated.
一般的抽气拔罐，罐内负压不好调节，不易取下。
A general suction pot for cupping is not easily lifted down, and the negative pressure in the pot is not easily regulated.
一般的抽气拔罐，罐内负压不好调节，不易取下。
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