[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f9Ahtc3FMyHUwctSnJNi1uJkw9gISsrWzig4SxwS-T0E":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2026-05-17 11:37:24",374240992,[8,9,10,11],"The echo sounder is used to determine the depth of the sea floor","Echo sounders rely on the same principles that radar and ultrasound utilize","An echo sounder is a safety device which can alert a ship to dangerous changes in the level of the sea floor","The flow of current interferes the reading of an echo sounder most",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},58,"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","work_53202024","Unit 8 Lesson 4-11 Exercises","Which of the following descriptions of the echo sounder is false",[21,32,41,50,58,67,76,85,94,103],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],374240983,[25,26,27,28],"automatic pilot steering","hand-electric steering","non-follow-up steering","rudder adjustment","The "Mode"selector switch on the autopilot steering stand is used to select any of the following with the EXCEPTION of( )","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],374240984,[36,37,38,39],"Every day","When tine allows","At least once a watch","NO checking is necessary","When steering by autopilot, how often should manual steering be checked",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],374240985,[45,46,47,48],"check the setting of the rudder adjustment","check the setting of the weather adjustment","switch to hand steering","immediately engage the trick wheel","While steering by autopilot you notice that the vessel has deviated 12 degrees from course and there is no corrective rudder being applied.As a standard operating procedure you should first",{"answer":51,"createTime":5,"id":52,"options":53,"question":57,"source":30,"type":31},[],374240986,[54,27,55,56],"follow-up steering","automatic steering","remote control steering","If the mode switch is in the "HAND" position, ( ) can be done with the steering handle at any time",{"answer":59,"createTime":5,"id":60,"options":61,"question":66,"source":30,"type":31},[],374240987,[62,63,64,65],"Rapson side indicator","Follow up","Rudder angle indicator","Telemotor position","Rudder position is show on the bridge by the( )",{"answer":68,"createTime":5,"id":69,"options":70,"question":75,"source":30,"type":31},[],374240988,[71,72,73,74],"actual depth of water","actual depth of water below keel","average depth from waterline to hard bottom","average depth of water to soft bottom","All echo-sounders can measure the",{"answer":77,"createTime":5,"id":78,"options":79,"question":84,"source":30,"type":31},[],374240989,[80,81,82,83],"Sea bottom","Ship's speed","Speed of current","Water temperature and density","What may affect the accuracy of sounding with echo sounder",{"answer":86,"createTime":5,"id":87,"options":88,"question":93,"source":30,"type":31},[],374240990,[89,90,91,92],"The marine sextant","The chronometer","The echo sounder","The radar","sends a radio signal from the bottom of the ship to the sea-bed, from which it is reflected",{"answer":95,"createTime":5,"id":96,"options":97,"question":102,"source":30,"type":31},[],374240991,[98,99,100,101],"Gain","Range","Frequency","Shallow alarm","Which one should be preset for echo sounder in order to avoid grounding",{"answer":104,"createTime":5,"id":6,"options":105,"question":19,"source":30,"type":31},[],[8,9,10,11]]