The radio waves used for radar are very short，only（）long.

A、A.a few centimeters

B、B.a few fathoms

C、C.a few meters

D、D.a few feet

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更多“The radio waves used for radar are very short，only（）long.”相关的问题

第1题

[] The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.

A、A.on loran charts covering areas where sky waves are used B、B.in the Radio Aids to Navigation，PUB 117 C、C.in the Loran-C Correction Tables D、D.Sky waves cannot be matched to ground waves in LORAN-C to produce a usable reading

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第2题

[单选题] Echo sounder sends a（） (无线电信号)from the bottom of the ship to the seabed.

A、radio signal B、radio wave C、signal D、signal radio

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第3题

[单选题] （）is a radio receiver with ablity to sense direction of the incoming radio waves.

A、The echo sounder B、The radar C、The course recorder D、The direction finder

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第4题

[单选题] Under the International Code of Signals how are geographical locations such as New York City transmitted?（）

A、A commonly used abbreviation such as NYC is used B、The name is spelled out C、The geographical coordinates are used D、The radio station call sign for the nearest marine radio station is used