After the hatch covers are closed, a transmitter generating an ultrasonic signal is placed in the cargo hold (empty or loaded with cargo) emitting ultrasonic waves.
当舱口盖被关闭时，产生的超声波信号的发射器被放置在货舱(空或装载货物)里发射超声波。
After the hatch covers are closed, a transmitter generating an ultrasonic signal is placed in the cargo hold (empty or loaded with cargo) emitting ultrasonic waves.
当舱口盖被关闭时，产生的超声波信号的发射器被放置在货舱(空或装载货物)里发射超声波。
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