The astrolabe had long been the primary instrument for navigation, having been introduced in the eleventh century.
自11世纪星盘被引入以来，它一直都是航海的重要工具。
The literature about primary instrument and secondary instrument of the flowmeter is summarized.
随后对该流量计一次仪表和二次仪表方面的研究做了全面介绍。
Keratometry - a keratometer is the primary instrument used to measure the curvature of the cornea.
角膜曲率检测——角膜曲率计是用来检测角膜曲率的仪器。
The Release Technique is so effective because it works directly on you as the primary instrument of change.
圣多纳释放法如此之有效，是因为它作为导致变化的原始工具直接作用于你本人。
The difficulty lies on keeping the amplitude in a proper range to activate the primary instrument, neither too high nor too low.
驱动设计的难点在于必须保持激振信号幅度在合适的范围内，过大过小都不能驱动一次仪表正常工作。
The drive system outputs to drive magnetic loop on the primary instrument, accordingly simulate the work condition of Coriolis force.
驱动系统输出信号驱动一次仪表上的线圈工作，模拟了科里奥利力的产生条件。
Gray's early music was in a contemporary folk-rock, singer-songwriter mode; his primary instrument was acoustic guitar, with occasional piano.
Gray早期的音乐类型属于当代摇滚民谣并且是一个唱作人。他早期使用的乐器是原声吉他，偶尔使用钢琴。
There are three branch circuits for phase signal. Two branches are completely similar to process phase signals respectively from right and left sensors on primary instrument.
信号预处理系统对原始的相位信号和温度信号进行预处理，使之适合数字电路作进一步的处理。
US Army New Training Helicopter(NTH)is a non-developmental item commercial helicopter which is to replace Bell UH-1H as an initial en- try rotary wing and primary instrument trainer.
美国陆军新型教练直升机是一个非新研项目的批量生产直升机，用以取代初级训练及仪表飞行训练用的贝尔UH-1H。
Analog circuit mainly realizes the drive system consisting of physical loop and gain-controlled loop and signal pre-processing system which ACTS on output signals from primary instrument.
模拟电路主要实现了由物理闭环和增益控制闭环构成的驱动系统，以及对一次仪表输出信号进行预处理的信号预处理系统。
The ideas of the past primary art aesthetic education have two kinds of non-aesthetic tendencies: the technique tendency and the instrument tendency.
以往小学艺术审美教育理念具有两种“非审美”的倾向：技术取向和工具取向。
The problem of error estimate in the primary measurement, the selection of measuring instrument accuracy and the calculation of the effective data are discussed and explained with examples.
讨论了物理实验基础知识中一次测量的误差估计、测量仪器精度的选择和有效数字运算等问题，并以实例予以说明。
The overall framework of thermodynamic Instrument with CAN bus, selection of primary components, design of electro circuit, and compilation of software are emphasized.
本文采用CAN总线建立现场众多核仪表之间的联系，并着重介绍了CAN总线热工仪表的总体架构以及主要元器件的选择、电路设计、软件编写等内容。
Water right trading is an effectual instrument for allocating water resources, and estimates of the water price are the primary factor affecting the trading.
水权交易是实现水资源有效配置的手段，而交易水价的估算又是进行水权交易的重要依据。
In the third chapter, the whole project, design principle, and primary guideline of system, which is electric measurement system in optical electronic instrument.
第三章论述了光电仪器电气性能检测系统的总体方案、设计原则和主要技术指标。
This paper introduces the primary functions, composing of the hardware and software, and the watch control and malfunction diagnosis principle of the instrument.
这里介绍了该状态监控与故障诊断仪的主要功能、硬件组成、软件组成，以及它的监控与诊断原理。
Objective Comparison of the curative effects on primary trigeminal neuralgia treated with trigeminus stereotactic instrument and free-hand puncture on semilunar ganglion.
目的比较应用三叉神经立体定向仪与徒手穿刺三叉神经半月节治疗原发性三叉神经痛的疗效。
Ocular structures of 32 cases (64 eyes) with acute primary Angle closure glaucoma were measured by color doppler instrument.
本文采用彩色多普勒仪对32例(64眼)原发性急性闭角型青光眼进行活体结构测量。
This instrument can measure automatically the oil consumption at the normal rating and the r. p. m. of the supercharger and the diesel, fitting with the corresponding primary meter.
这种装置可以自动测试柴油机在额定状态运行下的油耗率，并配合相应的一次元件能自动测试柴油机和增压器的转速。
Doubts were expressed concerning the validity and reliability of the primary measuring instrument.
人们对最初的测量工具的效度和信度产生了一些怀疑。
Simulant track training in offline is suitable for primary operator on the low level and it can protect transit instrument from attaint ting prolong the life-span of the transit instrument;
机下计算机模拟跟踪训练适合操作水平不高的初级操作者手，可有效保护经纬仪，延长经纬仪的使用寿命；
According to the requirements of Curriculum Target, students in primary and middle schools should learn the skill of singing and playing a musical instrument.
根据《课程目标》的要求，中小学生必须学习演唱、演奏的技能。
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