查询词典 jet-black

Self-advanced high pressure water jet drilling technology is to use mechanical or water jet apparatus to form a cavity at the selected coal seam, a specially made whip-stock is then to be installed in the cavity to drill inseam horizontal holes from the vertical well.

自进式高压水射流钻进技术是在煤层气勘探井內佈置机械或水力扩孔装置，对准选定的煤层进行扩孔后，下入特製的转向工具，在300 mm的曲率半径內实现由垂直转向水平进行钻进。

The water-bearing sand strata section from DK355+494 to DK355+517 of Xingwangmao tunnel has been successfully consolidated by horizontal jet grouting piles. The construction technology and construction method of consolidating sand strata by horizontal jet grouting piles are presented in the paper.

结合兴旺峁隧道改DK355+494～+517段含水砂层采用水平旋喷桩加固的成功实例，介绍水平旋喷桩加固砂层的施工工艺及方法；并对施工所需的人员、设备配制以及在施工过程中出现的&抢钻&、&断桩&与&短桩&的处理方法进行简单介绍。

The polyurea coating was tested with Taber tribomachine and the highp ressure water jet erosion tester for studying the wear behavior of polyure coating under conditions of dry friction and highspeed water jet contained sand. The morphology of the coating was observed with SEM and Chromatic confocal 3D Profiler. The surface component of test samp les was measured by FT2IR Spectrometer and Electron Energy Disperse Spectroscopy. The p roperties of polyurea coating under two testing conditionswas analyzed.

为研究聚脲涂层在干摩擦条件下和高速含砂水流冲蚀条件下的性能变化情况，用 Taber 磨损试验机和高速含沙水射冲蚀磨损试验机测试了聚脲涂层的磨损性能，用扫描电子显微镜和白光共焦三维轮廓仪观测涂层的磨损表面形貌，用表面红外光谱和电子显微镜能谱元素分析了涂层表面试验前后的组分变化，分析了涂层在2种摩擦条件下的磨损情况。

In order to investigate the flow characteristics of Isothermal jet into cross-flow for a safety injection inclined tube in the reactor cooling system, the numerical simulations were carried out at various velocity ratio between jet and main flow by using the commercial computational fluid dynamics software CFX.

针对核反应堆冷却剂系统中的主管道安注斜接管等温横向射流问题，应用计算流体力学商用软件CFX进行等温横向射流流动的数值模拟，得出了典型运行工况下的三维流场分布。

This is because the jet particle velocity of the swirling water jet is three-dimensional, and its rock-breaking manner mainly has a slopping impact. Thus, the interference from returning fluid is less. All these aspects make it easy to draw and shear the rock surface.

计算结果与试验一致，表明旋转射流具有较强的破岩能力，其原因是旋转射流的质点具有三维速度，破岩时以倾斜冲击为主，易于在岩石表面形成拉伸和剪切破坏，回流的干扰较少。

He decided to impress her by doing some jet skiing, so he hired a jet ski and got in the water.

於是他租了一台水上摩托车下水。

Jet vane is a way of achieving thrust vector control. However, solid rocket motors in the wake of the jet vane work will inevitably cause a degree of thrust loss, this will lead to decline SRM performance and shorten missile range.

燃气舵是实现推力矢量控制的一种方式，但在固体火箭发动机尾流工作中的燃气舵不可避免的造成一定程度的推力损失，导致发动机性能下降和导弹射程减小。

This is why a jet ski is called a jet ski.

这就是为什么喷气式滑雪被称为喷气滑雪。

The structure of core fiber and wrapped fiber in air-jet spun yarn was introducted base on Comprehensive analysis the development status and technology of Air-jet Spinning.

在全面的分析喷气纺纱的发展现状和技术的基础上，介绍了喷气纱的芯纤维和包缠纤维结构。

The mathematical model of plasma arc jet velocity at the exit of orifice logically combines the structural sizes of orifice with the plasma gas flow rate, the temperature of plasma arc at the exit of orifice, intensity of ionization and the force of arc pinch effect, by which the velocity of plasma arc jet can be estimated.

当喷嘴结构参数，离子气流量一定时，等离子弧在喷嘴出口处的温度和电离度的增加能使射流的喷嘴出口速度显著增加，而电磁压缩力使射流的喷嘴出口速度增加得较少。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。