This made Albert curious about the unseen forces that could keep compass needle always pointing north.

Does the direction of the compass needle change?

指南针的指针方向会改变 吗 ?

A compass needle points ( to the ) north.

罗盘的指针永远指向北方.

Does the compass needle return the original position?

指南针的指针会指回最初的方向 吗 ?

A compass needle always points to the north.

罗盘的指针总是指向北方.

A compass needle points north.

罗盘指针指向北方.

What happens to the direction of the compass needle? Why?

指南针的指针方向会发生什么变化? 为什么?

The first mention of magnetism and the equivalent of a magnetic compass are even earlier.

最早提到磁力和相当于磁力罗盘的书籍出现的时间甚至更早.

One of you asked this question. " Does a magnetic compass point to the North Pole? "

前段时间有观众向我们提问: “ 罗盘的指针真的指向北极 吗 ? ”

Electromagnetic compatibility is one of questions which the present electron ballast most needs to solve.

电磁兼容是目前电子镇流器最需要解决的问题之一.

The electromagnetic compatibility for theand control system the test tablesis discussed in this paper.

提出一种鲁棒重复控制方法用来提高无刷直流电机驱动测试转台的速率平稳性.

The experimental device has good electromagnetic compatibility, safe and convenient operation and stable performance.

这个实验装置具有良好的电磁兼容性, 操作安全方便,运行稳定.

Electromagnetic compatibility-Requirements for household appliances, electric tools and similar apparatus-Part 2: immunity-Product family standard.

电磁兼容性.家用设备 、 电动工具和类似器具的要求.第2部分: 抗干扰性. 产品系列标准.

Some questions in the electromagnetic compatibility field and the current research direction are also discussed here.

探讨了电磁兼容领域面临的问题以及当前的主要研究方向.

At last, some measures to solve Problem of electromagnetic compatibility were discussed appliance of plasma.

最后探讨了几种解决等离子体电磁兼容问题的方法.

This paper had introduced the technology of electromagnetic compatibility measurement in Reverberation-Chamber.

摘要本文介绍电磁兼容测量技术中的混波室测量技术.

Electromagnetic compatibility ( EMC ) -- Part 4-5: Testing and measurement techniques-Surge immunity test.

电磁兼容 --- 第4-5部分: 试验和测量技术 --- 抗电涌试验.

An on-line modified or modeling method of thermal error compensation model for CNC machines is presented.

提出了一种数控机床热误差补偿模型 在线 修正或在线建模的方法.

On the basis of above research, the measuring error compensation method for free-form surface is proposed.

在此基础上, 进一步提出了自由曲面测量误差的补偿方法.

And then it can offer the basis of error compensation for machinery procedure.

进而能为机加工程序提供误差补偿依据.

Study of the rowing movement, the speed of solving the error compensation method.

研究了划船运动下, 速度解算的误差补偿方法.