单选题目前多普勒计程仪采用双波束系统的目的是为了()的影响。A消除海底的性质不同给反射带来B抑制海洋噪声C克服声能被吸收的现象D消除风浪所引起的船舶垂直运动和船舶摇摆

单选题
目前多普勒计程仪采用双波束系统的目的是为了()的影响。
A

消除海底的性质不同给反射带来

B

抑制海洋噪声

C

克服声能被吸收的现象

D

消除风浪所引起的船舶垂直运动和船舶摇摆


参考解析

解析: 暂无解析

相关考题:

单选题当锅炉水碱度足够,硬度太高时一般加()。A磷酸钠B磷酸二钠C硝酸钠D亚硫酸钠

单选题在GMDSS系统中,中频(MF)通信分系统的工作频率范围是()。A415—4000KHzB4.0—27.5MHzC30—60MHzD156—174MHz

单选题船舶在波浪中的遭遇周期为12s,船舶自由横摇周期为()时产生谐摇。A6.4~12.6sB7.4~13.6sC8.4~15.6sD9.4~16.6s

单选题关于回油阀始点调节式喷油泵下列特点中错误的是()。A进油阀与柱塞并列在偏心轴同一侧B用进油阀关闭时刻控制供油始点C柱塞的最高位置为供油终点D用燃油手柄控制偏心轴以实现油量总调

单选题抛弃甲板货可以使船舶稳性()。A增大B减小C不变D以上均可能

单选题比动能是指()流体的动能。A单位质量B单位重力C单位体积D单位摩尔

单选题PLC的I/O口不具备的功能是()。A电平转换B光电隔离C状态指示D与上位机通讯

单选题疲劳最后断口区的尺寸越大说明()。A过载大B过载小C疲劳强度大D缺口敏感度大

单选题A vessel sailing shall keep out of the way of all of the following vessels except a vessel ().Anot under commandBengaged on pilotage dutyCrestricted in her ability to maneuverDengaged in fishing

单选题工作中提高班组成员情景意识的较好方法是:()。A对工作中出现的问题立即予以指出,并提出严厉批评;B对工作中出现的问题立即提出批评和提示,并强调该问题的危害性;C对工作中出现的问题立即提示,并鼓励其将工作做好;D以上均可。

单选题Bulkheads which from part of the tanks on a vessel are stiffened to withstand().Adeck loads from aboveBdynamic forces while afloatChydrostatic pressureDover-pressurization

单选题() in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine.ABecauseBOwing toCForDNo matter

单选题指出下述在备车中对冷却系统准备中的错误操作是()。A开启缸套淡水循环泵B开启海水循环泵C开启活塞冷却泵D开启喷油器冷却泵

单选题The output voltage of a 440 volt, 60 hertz, AC generator is controlled by the ().Aprime mover speedBexciter output voltageCload on the alternatorDnumber of poles

单选题在下列船舶中,可能不属于操纵能力受到限制的船舶是()。A从事拖带作业的船舶B扫雷船C自航式挖泥船D以上都是

单选题Which of the listed devices could be used as a ring groove tool during preparation for the installation of new rings?()ASteel brushBFine emery cloth or steel woolCA section of the removed compression ringDA case hardened scraper

单选题Personnel who are moving or handling material aboard ship should NOT follow which of the listed practices?()Asignaling that all personnel are clear before lifting or lowering materialBExamining material for sharp edges or protruding points before handlingCClosing, tagging, or securing valves that permit entrance of steam, water, or air into a fitting or other equipmentDThrowing materials from high places to the deck

单选题In a diesel engine, an extremely leaking exhaust valve can cause ().AmisfiringBpre-ignitionCinterrupted scavengingDreduced scavenging

单选题Noise in a refrigeration compressor can be caused by ().Aworn bearings and piston pinsBslugging due to flooding backCtoo much oil in circulationDAll of the above

单选题INMARSAT-E系统本身().A具有定位功能B不具有定位功能C不可预置位置D不能确定

单选题在AIS提供的信息中下列哪项信息的可信度较高()。A船型BIMO号码C定位天线在船上的位置D船首向

单选题That REMOVE ANY LIST ON THE V/L AFTER EACH WATCH END means that().Aany list,no matter where it is posted,shall be removed prior to ending his watch by the OOWBthe vessel should not be removedCany and all lists on board the vessel should be taken offDthe inclination of the vessel should be corrected prior to ending his watch by the OOW

单选题根据SulzerRTA型柴油机的配桨特性可知,超转速限制区域是指(),在()才允许使用,超负荷区域是指允许()运行区。A103%,新船试航时,1小时B104~108%,新船试航时,12小时内允许超负荷1小时C103%,新船试航时,12小时内允许超负荷1小时D104~108%,试验台试车时,12小时内允许超负荷1小时

单选题根据电阻应变效应不能测量的量是()。A压力B负荷C速度D力矩

单选题某船真航向045°,该船磁差2°W,自差3°E,该船左舷150°处物标罗方位为()。A255°B254°C256°D195°

单选题下列有关船追越说法哪项正确:()A当前船对位于其右舷正横后的船舶是否正在追越本船持有任何怀疑,应假定是在追越B当前船对位于其左舷正横后的船舶是否正在追越本船持有任何怀疑,应假定是在追越C当后船对本船是否处于追越前船持有任何怀疑时应假定是处于追越之中D当后船对本船是否处于追越前船持有任何怀疑时应假定不是处于追越之中

单选题根据《规则》第三十三条的规定,船舶应配备的声号设备根据船长L规定了四个等级:(),须配备一个号笛、一个号钟和一个号锣。AL≥100mB20m>L≥12mC100m>L≥20mDL<12m

单选题当船舶由深水进入浅水航道时,若主机供油量不变,船舶阻力R,转速n,船速v的关系是()。AR↑,n↑,v↑BR↓,n↓,v↓CR↑,n↓,v↓DR↑,n↑,v↓