_______ magnetism first found a practical use. A: That was in the compass B: It was in the compass that C: It was the compass that D: That was the compass

罗盘不规则工作。 A: The operation of the compass is irregular. B: Compass is erratic. C: Compass works with irregularity.

_______ the repeater compass with the master compass, please.

调节罗盘系统1直到和罗盘系统 2 一致。 A: Adjust compass system 1 until it agrees with compass system 2. B: Rig compass system 1 until it agrees with compass system 2. C: Synchronize compass system 1 with compass system 2.

确保磁罗盘系统 1 和磁罗盘系统 2 是同步的。 A: Make sure that compass system 1 and compass system 2 are synchronized. B: Make sure that compass system 1 and compass system 2 are coincident. C: Coordinate compass system 1 and compass system 2.

‍According to ancient records, natural magnets were employed in China as direction-finding devices. This led to the first compass, called ( ) during the Warring States Period. ​ A: wet compass B: Si Nan C: dry compass D: navy compass

If magnetic compass is not affected by any magnetic field other than the Earth’s, which statement is TRUE ___. A: Compass error and variation are equal B: Compass north will be true north C: Variation will equal deviation D: There will be no compass erro

Deviation is the angle between the（）. A: true meridian and the axis of the compass card B: true meridian and the magnetic meridian C: magnetic meridian and the axis of the compass card D: axis of the compass card and the degaussing meridia

全球导航卫星系统主要包括（）。 A: GPSB.GLONASS系统C.Compass卫星导航系统D.Galileo定位系统

compass 函数用来绘制散点图