A、测向仪
B、回声测深仪
C、罗经复示器
D、仪器
A、echo sounder B、instrument C、echo sounding D、sound signal
A、echo sounder B、instrument C、wheel D、course recorder
A、echo sounder B、radar C、direction finder D、radiotelephone
A、radio signal B、radio wave C、signal D、signal radio
A、The echo sounder B、The radar C、The course recorder D、The direction finder
A、The marine sextant B、The chronometer C、The echo sounder D、The radar
A、actual depth of water B、actual depth of water below keel C、average depth from waterline to hard bottom D、average depth of water to soft bottom
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