根据有关规定,载重量DWT处于2万吨至5万吨的船舶,所需的港作拖船总功率为:() ["0.075DWT","0.060DWT","0.050DWT","0.040DWT"]
焦炉煤气的设计流速一般比高炉煤气的设计流速(),原因是防止管道壁上沉积萘 ["A、低","B、相等","C、高"]
固定螺距螺旋桨拖船的牵引力与主机马力可用下式概算:() ["100马力=0.8吨牵引力","100马力=1.0吨牵引力","100马力=1.2吨牵引力","100马力=1.3吨牵引力"]
焦炉煤气管网上()使用铜质阀门。 ["A、不可以","B、可以","C、不一定"]
根据经验,风速低于15m/s,流速低于0.5kn,船舶总吨为5000,所需拖轮功率(kW)应约为:() ["450KW","550KW","650KW","750KW"]
诸葛亮智激周瑜(第44回)