99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

單項選擇題

International Navtex service is（）.

A.a terrestrial MF system
B.a satellite communication system
C.a land HF radio system
D.a coastal VHF system

你可能感興趣的試題

單項選擇題

What language does International NAVTEX use?（）

A.Russian
B.French
C.English
D.German

單項選擇題

When the power of SART is on, it will（）.

A.transmit distress signal
B.send response signal
C.transmit the signal of ship‟s position
D.be start by X-band radar

<ins id="zik5l"><output id="zik5l"><dd id="zik5l"></dd></output></ins>

<pre id="zik5l"><strong id="zik5l"></strong></pre>