_______ 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
A: That was in the compass
B: It was in the compass that
C: It was the compass that
D: That was the compass
举一反三
- 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
- 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.