magnetic c needle磁针
magnetic matrix needle磁针
magnetic pole needle磁极针
magnetic matrix needle compass磁针罗盘
magnetic diq needle磁倾针
magnetic dip needle磁倾仪
magnetic blunttip needle钝尖磁针
magnetic lifting needle磁提针
declination of magnetic needle磁偏角
N(名词) a slender magnetized rod used in certain instruments, such as the magnetic compass, for indicating the direction of a magnetic field (磁罗盘的)磁针; 用于指明磁场的方位