吊拖时拖缆的俯角一般应低于:() ["10°","15°","20°","25°"]
七星坛诸葛祭风(第49回)
根据经验,风速低于15m/s,流速低于0.5kn,船舶载重吨为10000t,所需拖轮功率(kW)应约为:() ["740KW","840KW","940KW","1040KW"]
甲烷是具有()气味的气体。
根据有关规定,载重量DWT≤2万吨的船舶,所需的港作拖船总功率为:() ["0.075DWT","0.060DWT","0.050DWT","0.040DWT"]
煤气燃烧的条件是充足的空气或氧气,(),高温或明火。