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

<xmp id="qvmum"><optgroup id="qvmum"></optgroup></xmp>

單項選擇題

From IMO’S point of view, INMARSAT’s most important function is the provision of（）.

A.general radio communication
B.MSI
C.improved distress and safety communication
D.bridge-to-bridge communication

你可能感興趣的試題

單項選擇題

（）is the united nations agency responsible for the Radio Regulations among other things.

A.ITU
B.IMO
C.MSC
D.WMO

單項選擇題

The purpose of the GMDSS is to（）safety of life and property at sea all over the world.

A.promote
B.improve
C.guarantee
D.both A and B