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

<ins id="nczwo"></ins>

單項(xiàng)選擇題

International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.

A.518
B.2182
C.156.8
D.2187.5

你可能感興趣的試題

單項(xiàng)選擇題

Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.

A.1 February 1995
B.1 February 1992
C.1 July 1997
D.1 February 1999

單項(xiàng)選擇題

In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.

A.MF/HF
B.SART
C.EPIRB
D.any of A, B, C

<pre id="wd9b9"><acronym id="wd9b9"></acronym></pre>

<dl id="wd9b9"></dl>