单选题本船前方河道入口处两侧有陡山,河口宽度为300米,雷达天线水平波束宽度为1º,本船离河口()海里以外时,雷达荧光屏上河口将被两侧陡山回波堵满。A7.5B9.3C10.4D6
单选题
本船前方河道入口处两侧有陡山,河口宽度为300米,雷达天线水平波束宽度为1º,本船离河口()海里以外时,雷达荧光屏上河口将被两侧陡山回波堵满。
A
7.5
B
9.3
C
10.4
D
6
参考解析
解析:
暂无解析
相关考题:
单选题This is()where we shall anchor.Athe light-houseBthe anchorageCthe pilot stationDthe light-buoy
单选题For occasional heavy loads, two cranes can be arranged to work together. The operating () for deck crane motors may be hydraulic electric.AprincipleBmediumCinstructionDvoltage
单选题During the watch keeping at sea, routine adjustments should be ()Amade and noted as required by the duty engineerBreported to chief engineer immediately after being made by duty engineerCnever made before getting permission from chief engineerDmade as required but not logged
单选题按规定GMDSS船舶在海上航行时,应在()上保持连续值守。①VHFCH16及CH13;②无线电话遇险频率2182kHz;③适当的DSC遇险和安全频率;④接收MSI的信道;⑤VHFCH70A①②⑤B①③⑤C③④⑤D①③④
单选题To avoid scavenge fires occurring the engine timing and equipment maintenance ().Ashould be correctly carried outBshould correctly be taken placeCshould carried with careDmust to carry out with great care
单选题关于WARTSILA SULZER RT-FLEX系列智能柴油机与MAN BW ME系列智能柴油机的操纵系统根本区别在于RT-FLEX系列电子控制(),ME系列电子控制()。A储压器/高压油泵B容积喷射控制单元/储压器C储压器/容积喷射控制单元D容积喷射控制单元/高压油泵
单选题In a twin screw ship going half-ahead,both screws turning outboard and the rudder amidships,no current or wind,the vessel will().AMove bodily to portBMove bodily to starboardCMove in a zig-zag motionDSteer a fairly straight course
单选题离心式压气机喘振的基本原因是()。A流量减少,背压增高,气流在工作叶轮前缘叶片凸面发生分离而产生B流量增加,背压降低,气流在工作叶轮前缘叶片凸面发生分离而产生C流量减少,背压增高,气流在工作叶轮前缘叶片凹面发生分离而产生D流量增加,背压降低,气流在工作叶轮前缘叶片凹面发生分离而产生