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1、2017航海英语复习三Key word 10: Radar and ARPA（60）A335. Radar makes it possible and much safer for us to sail _.A. in dense fog B. in boisterous weather C. in the open sea D. in rivers【知识点】雷达的使用【解析】主要作用：雾航B380. Radar makes the most accurate determination of the _.A. direction of a target B. distance to a ta
2、rget C. size of a target D. shape of a target【知识点】雷达的使用【解析】雷达测距最准确。相关题目A382. Without doubt the radar is a highly important navigation aid. But duty officer shall aware that _when using it.A. Its range reading is more accurate than its bearing readingB. A low-lying coastline with a long, flat beach w
3、ill show up properly on the radar.C. Radar is only aimed at collision avoidance.D. the use of radar is necessary only when visibility is restricted、D527. Radar is not only to obtain _, but also to measure their distance away from you.A. brightness of objects B. color of targets C. shape of targets D
4、. bearing of objectsD361. Which statement concerning the operation of radar in fog is TURE ?A. radar ranges are less accurate in fog B. navigation buoys will always show up on radarC. a sandy beach will show up clearer on radar than a rocky cliffD. small wooden boats may not show up on radarB327. Th
5、e correct method of switching off a marine radar is to turn power switch to _ position first, then to _ position.A. off / standby B. standby / off C. standby / close D. close / standby【知识点】雷达的使用【解析】雷达关机步骤。B606、As the radar antenna scans through _ a rotation , it can be show where the target is relat
6、ive to your position .A. 60 degree B. 360 degree C. 180 degree D. 90 degree【知识点】雷达的使用【解析】雷达天线。A345. The radar control that reduces weak echoes out to a limited distance from the ship is the _A. sensitivity time control ( sea-clutter control) B. receiver gain controlC. brilliance control D. fast time
7、 constant ( differentiator )【知识点】雷达的使用（控钮）【解析】近距离的杂波相关题目D346. The radar control that shortens all echoes on the display and reduces clutter caused by rain or snow is the _. A. sensitivity time control (sea clutter control) B. receiver gain control C. brilliance control D. fast time constant (differe
8、ntiator)D372. _is on the panel of radar. A.KEYLOCK B.REPEATER C.STATIC INVERTER D.ANTI-CLUTTER-SEAA391. What is the purpose of VRM control?A. To measure distance accurately B. To measure bearing accuratelyC. To measure range and bearing D. To adjust radar monitor【知识点】雷达的使用【解析】活动距标圈。D557. SWEEP INT o
9、n radar panel is the abbreviation of_Asweep introduction Bsweep interest Csweep intention Dsweep intensity【知识点】雷达的使用【解析】扫描亮度A605、When will you have to adjust gain ?A. every time you change ranges B. each watch C. every day D. every week【知识点】雷达的使用【解析】增益：每次改变量程后需重新调整。D352. When hitting a solid object
10、such as a ship or an airplane, the radar waves are reflected back _ they came.A. in the way B. the way C. by the way D. through the path【知识点】雷达的工作原理【解析】雷达波路径B360. Which general statement concerning radar is FALSE?A. raising the antenna height increases the radar range B. the ability of radar to dete
11、ct objects is unaffected by weather conditionsC. radar bearing are less accurate than radar rangeD. radar should be checked regularly during clear weather to ensure that it is operating properly 【知识点】雷达的工作原理【解析】雷达探测物标的能力会受到天气的影响。A348. The radio waves used for radar are very short，only _ longAa few c
12、entimeters Ba few fathoms Ca few meters Da few feet【知识点】雷达技术指标（波长）【解析】航海雷达主要是3cm和10cmC336. The 10-cm radar as compared to a 3-cm radar of similar specifications will _.A. be more suitable for river and harbor navigationB. provide better range performance on low lying targets during good weather and
13、calm seasC. have a wider horizontal beam width D. have more sea return during rough sea conditions【知识点】雷达技术指标（波长）【解析】1）最大作用距离：正常天气下，3cm雷达的大；雨雪天，10cm雷达的大。 2）距离分辨力和测距精度：波长短，脉冲前沿短，脉冲宽度短3cm好。3）方位分辨力和测方位精度：波长越短，波束宽度越窄3cm好。4）抗杂波能力：10cm好。相关题目D337. The 3-cm radar as compared to a 10-cm radar with similar sp
14、ecifications will _.A. give better range performance in rain, hail, etc.B. display small targets in a mass of dense sea clutter at a greater rangeC. have less sea return in choppy rough seasD. display a more maplike presentation for inshore navigationA364. Coral atolls, or a chain of islands at righ
15、t angles to the radar beam, may show as a long line rather than as individual targets due to _.A. the effects of beam width B. limitations on range resolutionC. the pulse length of the radar D. the multiple-target resolution factor【知识点】雷达技术指标（天线波束宽度）【解析】天线水平波束宽度对方位分辨力的影响。A 237. You are using radar in which your
