These tree belts protected 500000 acres of farmland against shifting sand.

The tree belts can protect this area against shifting sand.

护林带能保护这个地区不受流沙的侵害.

These tree belts protect 500000 acres of farmland against shifting sand.

这些防护林带保护了50万英亩的农田不受流沙的侵袭.

These tree belts protect 500,000 acres of farmland against shifting sand.

这些保护林带保护了50万英亩的农田不受流沙的侵袭.

The wooden hull parts that we find have been buried by shifting sand or mud.

我们发现的木船船体的某些部分是埋在流沙或泥中的.

The dunes here are linear, thought to be due to shifting wind directions.

这里的沙丘是线性的, 认为是由于风的方向转变.

Then the paper presents a phase measurement method of frequency shifting based on multiple spectral bands.

并提出了一种多谱段分色频移相位测量方法,给出了测量原理和精度的分析.

The characteristics and operation principle phase-shifting PWM controller UCC 3895 are introduced in this article.

详细介绍了移相型PWM控制器UCC3895的特性、引脚功能、主要参数、工作原理以及典型应用电路等.

A four-step phase shifting method is presented-field digital determination of the stress parameter of optical glass.

提出了一种用四步移相法实现光学玻璃应力等倾角全场数字化测量的方法.

However, for small tilt angle the laser and phase shifting measurement agree closely.

然而, 小倾角的激光和相移测量同意密切.

This thesis proposes a N step color phase-shifting method for measuring 3 D shape of objects.

本论文提出一种N步彩色相位移法用以量测物体的三维外形.

A point-diffraction interferometry was presented based on Fourier transform instead of the phase-shifting point-diffraction interferometry.

在相移算法的点衍射干涉术的基础上,提出了基于傅里叶变换的点衍射干涉测量术.

This system consists of phase-measuring instrument, digital phase shifting generator and phase three network components.

此系统由相位测量仪 、 数字式移相信号发生器和移相网络三部分组成.

For the anti-vibration in interferometry, a new simultaneous phase-shifting method Michelson polarization phase-shifting technique, is presented.

为了干涉测量的 抗振 目的, 提出了一种新的同步移相干涉测量方案并搭建了实验装置.

D topography measurement consists of Moires method , phase-shifting method shadow moir é profilometry.

三维物体形貌测量技术包括:云纹轮廓术 、 相位测量法、投影栅线相位轮廓术.

This method has advantages : measure by single frame, no phase-shifting error.

该方法具有单帧测量 、 无相移误差的优点.

As a part of the project, an automatic gear shifting system was developed.

作为试验台建设项目的一部分, 本文着重解决了仿真试验台中的自动换档控制问题.

The mesh-type gear shifting handle consists of handle itself, aluminium tube , slanting casing, and top cover.

网孔式换档手柄由柄体 、 铝管 、 斜套和顶盖组成.

It can give automobile smooth starting and gear shifting, convenient operation, and comfortable driving.

它能够使汽车起步平稳、换档平顺 、 操作方便,简化了手动换档操作, 使驾驶更加轻松自如.

The kernel of automatic gear shifting is gear-shift schedule.

自动换档规律是自动变速技术的核心.

Changes in β-adrenocepters in heart and lung during cardiac arrest in an asphyxiated rat model

大鼠窒息心脏骤停期间心脏和肺脏β肾上腺素能受体的变化