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1、第二节 雷达及ARPA的使用 1156. _A_ is not a job of the radar antenna 下列哪一项不是雷达天线的功用（）ATo receive the high-frequency pulses from the transmitter 接受发射器发来的高频脉冲BTo focus the pulses into a beam，and send them into space 把脉冲集中成束，并发射出去CTo pick up reflected pulses coming from objects that have been struck by the beam
2、接受从物标反射回来的脉冲波束DTo reflect microwaves 反射微波1157. _D_ is not used in modern radar 下列哪一项不用于现代雷达AEBL 电子方位线BVRM 活动距标圈CCRT 荧光屏DGrease pencil 蜡笔1158. _D_ typically extends from close as 0.1 nautical miles out to 32 NM （）可近来可达0.1海里,最远可达32海里AEBL 电子方位线BVRM 活动距标圈CCRT 荧光屏 Dtarget tracking range 物标跟踪范畴1159. Altho
3、ugh manual plotting for CPA works well，the workload can become overwhelming when confronted with _D_ 虽然使用人工标绘也可以精确求出近来会遇距离，但是，当遇到（）时，工作量将变得非常大。Aone target Btwo targets Cthree targets Da large number of targets 大量的物标时1160. I _C_ shorebased radar assistance 我（）岸基雷达协助AAsk 问BLook for 寻找CRequire 需要DIn ne
4、ed of 缺少1162. My radar is not workingI require shore based radar assistanceIs shore based radar assistance _B_? 834我船雷达故障，我需要岸基雷达协助，与否有岸基雷达（）Aused 已使用的Bavailable 可以使用Cin use 正在用Dcan be used 能被使用1163. PPI is _A_ PPI是指什么Aa plan-position indicator system 平面位置显示屏Bpulse-plan integration Cpulse-pulse inpu
5、t Dpower-plan input 1164. Radar makes it possible and much safer for us to sail _A_ 在（）状况下，雷达使我们的航行更加安全AIn dense fog 浓雾中BIn boisterous weather 恶劣天气CIn the open sea 在大海上DIn rivers 在河道中1165. Radar reflectors are required for _D_923下列什么船需要安装雷达反射器Aall fishing vessels over 39 feet in length 所有长度不小于39英尺的渔
6、船Bsail-propelled fishing vessels 机帆并用的渔船Call fishing vessels of less than 200 GT 所有不不小于200总吨的渔船Dwooden hull fishing vessels with a poor radar echo 雷达回波反射性差的木质渔船1166. SWEEP INT（扫描线亮度）on radar panel is the abbreviation of _D_ 雷达面板上，“SWEEP INT”是下列哪一种词组的缩写（）Asweep introduction 引入、简介Bsweep interest 爱好Csw
7、eep intention 意图Dsweep intensity 强度、亮度1167. The _A_ has a built-in world map; most areas are displayed on a scale of 4000 nm from the top to the bottom of the screen，and can be zoomed in to 150 nm 下列哪一种设备有内置的世界地图，在屏幕上，从上到下最大可显示范畴是4000海里，也可放大到显示范畴为150海里Achartplotter BC-MAP NT一种海图类型CC-Cards DPPI A Cha
8、rtplotter is a device used in marine navigation that integrates GPS data with an electronic navigational chart (ENC). The chartplotter displays the ENC along with the position, heading and speed of the ship, and may display additional information from radar, automatic information systems (AIS) or ot
9、her sensors. As appropriate to particular marine applications, chartplotters may also display data from other sensors, such as echolocators/sonar.1168. The 10-cm radar as compared to a 3-cm radar of similar specifications will _C_955如果其她多种参数都同样，与3厘米波雷达相比，10厘米波雷达有什么特点（）ABe more suitable for river and
10、 harbor navigation 更适合在河道及港内使用BProvide better range performance on low lying targets during good weather and calm seas 在天气好，海面安静的状况下，对远距离的低平物标更容易发现CHave a wider horizontal beam width 波束宽度更宽DHave more sea return during rough sea conditions 在天气恶劣状况下，有更多的海浪回波1169. The articulated light is superior to o
11、ther types of buoys because _D_ 发光清晰的灯标优于其她种类的浮标，这是由于（）AThe radar reflectors reflect better signals 雷达反射器的回波更好BFog horn signals travel farther to sea 雾号在海上传播的距离更远CIt is equipped with strobe lights这种灯标配有闪光灯DIt has a reduced watch circle这种灯标的观测周期较小1170. The closest point of approach（CPA）of a contact o
12、n a relative motion radar may be determined _C_999相对运动显示模式下，在什么状况下，可以判断出CPA（）AImmediately when the contact is noted on radar 在雷达上一看到物标回波，立即可以BOnly if the radar scope is watched constantly 只有始终观测雷达才可以CAfter the contact has been marked at least twice 至少回波浮现两次后来才可以DBy an occasional glance at the radar
13、偶尔看一眼雷达就可以1171. The correct method of switching off a marine radar is to turn power switch to _ position first，then to _B_ position1008关闭航海雷达的对的措施是，先把电源开关旋钮旋到（）再旋到（）AOff/standby BStandby/off CStandby/close DClose/standby 1172. The development of _B_ led to the fully automatic ARPA systems installed
14、on commercial ships 由于（）技术的发展，最后使商船可以安装全自动的“ARPA自动标绘雷达”系统ASeaTalk Bpowerful microprocessors and mega memory capacity 功能强大的微机解决器及容量巨大的存储器Cchartplotter 海图标绘器Dsmall-scale chart 小比例海图1173. The radar control that reduces weak echoes out to a limited distance from the ship is the _A_1158减少一定距离内的微小回波显示的控钮是
15、（）Asensitivity time control（sea-clutter control） 海浪干扰克制Breceiver gain control 增益Cbrilliance control 亮度Dfast time constant（differentiator）微分调节1174. The radar control used to reduce sea return at close ranges is the _B_1160减少近距离内的海浪回波显示的控钮是（）AGain control 增益BSensitivity time control海浪干扰克制CFast time constant微分调节DPulse length control 脉冲宽度1175. The radio waves used for radar are very short，only _A_ long 雷达使用的无线电波很短，只有（）长AA few centimeters 几厘
