指南针

A device used to determine geographic direction, usually consisting of a magnetic needle or needles ''.

指南针用于确定地理方向的设备，通常包括一个或多个''。

Think of the earth as having a big bar magnet stuck through it, with the southern end located at the magnetic north pole. The northern end of the compass will point toward the magnetic north pole.

想像有一根大磁条穿过地球，磁条的S极设置在地理北极附近，因此指南针的N极会指向地球的北磁极。

In the form of a card that rotates so that 0 degrees or North points to magnetic north.

一种旋转的像罗盘的片状指南针，所以零度或北方能够指向磁北。

A needle that points to magnetic north.

指指南针，罗盘的意思。

They can track the earths magnetic field as sensitively as a compass needle.

它们对地球磁场也十分敏感，如同使用了指南针。

A compass is usually considered mandatory but you have to be careful using it.

指南针通常被认为是强制性的，但你要小心使用。

But what is more surprising is that even a contrived mariner''s compass was used by Indian navigators nearly 1500 to 2000 years ago.

但更加令人惊讶的是，即使是一个做作的水手指南针也几乎在1500到2000年前的印度航海业上使用。

Methods The design and mechanism of the micturition alert device were explained, the effectiveness was tested in a cranine experiment.

根据指南针原理设计神经源性膀胱排尿报警装置，通过动物实验对该装置的有效性进行验证。

With the development of processing industries and key lines from the original needle into a needle-shaped by the water with floating needle into a thimble, so that measurement accuracy of the compass a qualitative change.

随着加工业的发展，磁针由原来的匙行转变为针形，并由水浮磁针转变为用顶针，使指南针的测量精度发生了质的变化。

Hans Oersted found in 1819 that he could make a needle of compass move by putting it near a wire with a current flowing through it.

汉斯·奥斯特于1819年发现，把指南针放在有电流通过的导线的附近时，能使指针摆动。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。