英语阅读与翻译试题、答案-潘书策提供.docVIP

I、Reading Comprehension A、On-scene(现场)communications are those between the mobile unit in distress and assisting mobile units, and between the mobile units and the unit coordinating search and rescue operations. Control(管制)of on-scene communications is the responsibility(职责)of the unit coordinating search and rescue operations. Simplex(单工)communications shall be used so that all on-scene mobile stations may share relevant information concerning the distress incident. If direct-printing telegraphy is used, it shall be in the forward error-correcting mode(纠错方式) The preferred(选用)frequency in radiotelephony for on-scene communications are 156.8MHz and 2182kHz. The frequency 2174.5kHz may also be used for ship-to-ship on-scene communications using narrow-band direct-printing telegraphy in the forward error-correcting mode. In addition to156.8MHz and 2182kHz,the frequencies 3023kHz, 4125kHz, 5680kHz, 123.1MHz and 156.3MHz may be used for ship-to-aircraft on-scene communications. The selection or designation(指定)of on-scene frequencies is the responsibility of the unit coordinating search and rescue operations. Normally, once an on-scene frequency is established a continuous aural(不断收听)or teleprinter watch(电传机职守)is maintained by all participating on-scene mobile units on the selected frequency. Locating signals are radio transmissions intended to-facilitate（使容易） the finding of a mobile unit in distress or the location of survivors. These signals include those transmitted by searching units and those transmitted by the mobile unit in distress , by survival craft by float-free EPIRBs, by satellite EPIRBs and by search and rescue radar transponders(应答器) to assist the searching units. Homing(引航)signals are those locating signals which are transmitted by mobile units in distress, or by survival craft, for the purpose of providing searching units with a signal that can be used to determine the bearing to the transmitting stations. Locating signals maybe transmitted