地文航海50题.doc

10.2 地文航海 [2701]Leeway is the ______.偏航是 A.? difference between the true course and the compass courseB.? momentum of a vessel after her engines have been stopped主机停机后船舶的动量 C.? lateral movement of a vessel downwind of her intended course船舶沿预期航向顺风的横向位移 D.? displacement of a vessel multiplied by her speed乘以船速的船舶移位 KEY:? C [2702]______ is the process by which the position of the vessel at any moment is found by applying the last well-determined position to the run that has been made since，using for this purpose the ship‘s course and the distance being those indicated by log．船位推算是通过将必威体育精装版确定的位置应用于已经使用的航行路程来找到船舶在任何时间所处位置的方法。为这一目的，使用计程仪显示的航向和距离。 A.? dead reckoning B.? dead weight静载荷 C.? dead slow ahead 微速前进 D.? dead slow astern 微速后退 KEY:? A * 航迹推算dead reckoning是根据船上最基本的航海仪器（罗经和计程仪）所指示的航向和航程，结合海区内的风流要素，不借助外界物标或航标，从某一已知船位起，推算出具有一定精度的航迹和某一时刻的船位方法。 [2703]______ means the curve on the earth‘s surface which cuts all the meridians at the same angle．恒向线是指在地球表面上以同样角度与所有子午线（经线）相交的曲线。 A.? Great Circle B.? Position Line方位线 C.? Rhumb line等角航线，恒向线； D.? True Bearing真方位 KEY:? C * A Great Circleis the shortest distance between any two points on the earth。 [2704]A bold reef 陡峭的暗礁is a reef ______.A.? with part of it extending above the water部分暗礁延伸到水面上 B.? that can be detected by water turbulence湍流可以检测到 C.? that drops off sharply突然下降 D.? perpendicular to the current垂直于涌流 KEY:? B [2705]A buoy having red and green horizontal bands would have a light characteristic of ______.一个浮标的标身上的条文是红和绿横纹，它的灯光特性是____。 A.? interrupted quick flashing间断快闪 B.? composite group flashing 混联闪 C.? Morse (A)莫斯码A D.? quick flashing 快闪 KEY:? B [2706]A buoy marking a wreck will show a(n)____.标示沉船的浮标会显示___. A.? white light FL (2) and a topmark of 2 black spheres闪2白光和2个黑球组成的顶标。 B.? occulting green light and may be lettered明暗绿光，且有可能用字母识别 C.? yellow light and will be numbered黄光，且会被有编号 D.? continuous quick white light and may be numbered连续快闪白光，且会被有编