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

<pre id="alt00"><legend id="alt00"></legend></pre>

單項(xiàng)選擇題

It is danger for vessels without the use of（）to approach the estuary in such poor visibility.

A.Loran C
B.Direction Finder
C.Gyro- compass
D.Radar

你可能感興趣的試題

單項(xiàng)選擇題

When visibility is 20 nautical miles, we say that visibility is（）.

A.very good
B.good
C.poor
D.moderate

單項(xiàng)選擇題

Our ship has not been to shipyard for a long time, the fouling on the ship’s hull greatly decreases her（）.

A.resistance
B.weight
C.speed
D.displacement