_____ sends a radio signal from the bottom of the ship to the sea-bed, from which it is reflected. A. The marine sextant B. The chronometer C. The echo sounder D. The radar

单选题

_____ sends a radio signal from the bottom of the ship to the sea-bed, from which it is reflected. A. The marine sextant B. The chronometerC. The echo sounder D. The radar

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单选题

Would you mind _____ the radio a little, please?

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单选题

radio altimeter

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单选题

The concept of television, _____ images over distances, had intrigued scientists even before the invention of moving pictures or radio.

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问答题

5.The radio set

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