[40]The GPS satellite orbits the earth in approximately_______. A.3 hours B.6 hours C.12 hours D.24 hours
答案：C全球定位通讯卫星围绕地球轨道运行大约12小时
[41]GPS receiver errors depend on ________. A.operation B.installation C.display type D.construction 答案：D
GPS接收误差取决于结构
[42]Error in the GPS positions has nothing to do with _____. A.user clock bias B.satellite clock bias C.atmospheric interference D.ship's position 答案：D
GPS位置误差于船舶位置无关
[43]What is the main purpose of DGPS? A.Improve positioning accuracy B.Decrease positioning accuracy C.Reduce operational cost D.I don't know 答案：A
差分GPS的主要目的是什么？改良定位精度
[44]The acccuracy of the DGPS mainly depends on_______. A.The price of the equipment
B.The relative angle between the satellite C.The position of the observer D.The age of the calculated correction 答案：D
差分GPS的精度主要依赖于计算改正量
[45]What is the purpose of a Pedestal（基座，柱脚） Roile? A.To change the direction of lead on a mooring line B.To secure a chain
C.To secure the eye of a mooring line D.To facilitate towing 答案：A
Pedestal Roile的用途是什么？改变系泊缆的导向
[46]You stand a greater risk of injuring yourself or your shipmate during mooring and unmooring operations than at any other time. So remember________.
A.Do not wear safety shoes,gloves and an overall with long sleeves B.Stand as closely as possible in the rope rail
C.Do not work too close to the drum when handling wires/ropes D.If the line takes charge, try to stop it with your feet/hands 答案：C跟其他任何比起来，在系离泊的时候你和你的船友有更大的危险。因此记住在操作绳索的时候不要工作靠太近鼓轮
[47]Which one of the followings is not a right way to behave during mooring unmooring operation? A.Stay close to the towline at all time B.Beware the bights
C.When operating the winch/windlass,ensure that yourself understand the controls
D.When the tug is being secured or let go, monitor the operation closely 答案：A
在系离泊期间以下哪一项不是正确的方法举动？保持拖缆随时拉紧
[48]The most serious danger from synthetic ropes is____,which is
the sudden release of the energy stored in the stretched synthetic line when it breaks A.Rotting B.Wear and tear C.Snapback D.Weakness 答案：C
人造绳最大的危险是急速反弹---当断掉的时候突然释放拉伸人造绳时蓄积的能量
[49]Unlike wires,synthetic ropes do not give audible_____of pending failure and may not exhibit any broken elements before completely parting A.broken B.slack C.track D.sign
答案：D不同的绳子，人造绳直到破坏以前不会发出听得见的迹象，在完全分开以前不会出现任何破断的迹象
[50]a ship does not possess an all-wire or all-sythetic mooring outfit, the best procedure is to use____ for spring and breast lines and
_____for headlines and stern lines. A.The synthetic ropes,the wires B.The wires,the synthetic ropes
C.The wires,the synthetic ropes with the wires
D.The synthetic ropes with the wires, the same as the former 答案：船舶不会具有全金属绳或者全人造绳锚泊设备，最好的方法是用金属绳做倒缆和横缆，用人造绳做首缆和尾缆
51．The ideal rope for stoppers should satisfy the following requirements except that _____.
A. The stopper should be of synthetic fibre rope B. The size of the stopper should be as large as possible C. The stopper should be of low stretch material D. The stopper should be very flexible 答案：B
52. Usually, do not use more than _____ complete rope turns around the drum. A. 1-2 B. 3-4 C. 5-6 D. 7-8 答案：B