单选题The primary duty of lube oil is to reduce （） between the working parts of an engine.Apower outputBfriction and wearCindicated pressureDrated horsepower
单选题
The primary duty of lube oil is to reduce （） between the working parts of an engine.
A
power output
B
friction and wear
C
indicated pressure
D
rated horsepower
参考解析
解析：
暂无解析
相关考题：
单选题One advantage of a flash distilling plant when compared to a submerged tube distiller is（）Agreater distillate purity through high temperature evaporationBcold shocking for scale removal is not requiredCless internal corrosion because of lower brine densityDless feed-water is required for equal plant capacity
单选题以下公约中，以船舶的总吨作为公约吨的是（）.A海事索赔限制公约和《1984年国际油污损害民事责任公约》B油污损害民事公约和《1957年海船所有人责任限制公约》C《1984年国际油污损害民事责任公约》和油污损害民事公约D以上都不是
单选题You’d better（）the optional cargo block stowage in the tweendecks, then it can be easily discharged either at Shanghai or Dalian.AgiveBto giveCgivenDgiving
单选题某一干电池，当外电阻RL为1Ω时，电流为1A，当外电阻R？L为2.5Ω时，电流为0.5A。则电池的电动势（）V、内阻为（）Ω。A1.5/1.5B1.5/0.5C2.5/1.5D2.5/0.5
单选题When you doubt the existence of risk of collision,（）.Asuch risk shall be deemed to existBsuch risk shall not be deemed to existCyou needn't take any action to avoid collision with any vesselDyou should accelerate your speed ahead
单选题To counteract these undesirable effects cylinder oils usually contain additives formulated to impart a high degree of （） and detergency.AsalinityBalkalinityCacidDsanitary
单选题A carbon dioxide fire extinguisher should be recharged（）.Aat least annuallyBwhenever it is below its required weightConly if the extinguisher has been usedDbefore every safety inspection
单选题对于逆功率保护下列说法错误的是（）。A同步发电单机运行时，不必设置逆功率保护B逆功率保护是对并联运行的发电机避免出现电动机运行的保护C船舶发电机的逆功率保护通常是有延时的，且逆功率越大延时越短D为了防止并联运行发电机变为电动机运行，加重正常运行发电机组的负担，逆功率保护应瞬时动作
单选题轮机长在调动时在下列项目中，向接班轮机长应重点介绍（）。 a．机炉舱安全规定； b．有关应急设备技术状况和使用方法； c．轮机部人员情况； d．核对或测量燃、润油料的实际存量。Aa+b+dBb+cCa+b+c+dDa+b+c
单选题下列有关内底板和内底边板描述不正确的是（）。A内底板和内底边板的长度也就是双层底的长度B在每个双层底舱的内底板上至少开设有两个成对角线布置的长圆形或圆形人孔C内底边板比内底板厚些D内底板与舭列板相连接
单选题With ducted air conditioning systems, the modern tendency is to use（）Acentral air conditioning systemBhigh velocity systemClow velocity systemDsingle duct system
单选题柴油机运转初期产生的磨合拉缸，其损伤部位一般在气缸套与（）工作表面。A活塞B活塞裙C活塞环D活塞环及活塞裙