生活史(1ife cycle)
生活史(1ife cycle)
相关考题：
Feasibility studies occur in which life cycle phase (s)?A.ConceptualB.Conceptual or DevelopmentC.ExecutionD.Preliminary planningE.any life cycle phase
141 Feasibility studies occur in which life cycle phase (s)?A. ConceptualB. Conceptual or DevelopmentC. ExecutionD. Preliminary planningE. any life cycle phase
● Feasibility studies occur in which life cycle phase (s)?A ConceptualB Conceptual or DevelopmentC ExecutionD Preliminary planningE any life cycle phase
If all other conditions such as bore, stroke, speed, and mean effective pressures are equal, a two stroke/cycle diesel engine will develop approximatelyA.the same indicated horsepower as a four-stroke/cycle engineB.twice the indicated horsepower as a four-stroke/cycle engineC.one half the indicated horsepower as a four-stroke/cycle engineD.one power stroke for every two crankshaft revolutions
The life cycle of a project is a description of the various phases of the project from the beginning to the end. One of the followings is not a phase of the traditional project life cycle, It is（ ）.A.developmentB.conceptC.system analysisD.implementation
One hertz is equal to one ( )A、cycle per centimeterB、cycle per meterC、cycle per secondD、cycle per eV
关于CYCLE93指令，（）（SIEMENS系统）。A、CYCLE93是切槽循环指令B、使用CYCLE93指令可以简化编程C、CYCLE93指令可实现断屑加工D、CYCLE93指令可用于切削圆锥面和圆弧面E、CYCLE93可用于径向沟槽的切削加工
关于CYCLE81指令，下面说法正确的是（）（SIEMENS系统）。A、CYCLE81是深孔钻循环指令B、使用CYCLE81指令可以简化编程C、CYCLE81指令执行间歇切削进给到孔的底部D、完成CYCLE81指令后刀具将返回到返回平面E、用CYCLE81指令钻孔切削到孔底后，刀具快速返回
关于CYCLE83指令，下面说法正确的是（）A、CYCLE83是深钻孔循环指令B、使用CYCLE83指令可以简化编程C、CYCLE83指令执行连续切削进给到孔的地步D、完成CYCLE83指令后刀具将返回到参考平面E、用CYCLE83指令钻孔切削到孔底后，刀具快速返回
单选题If all other conditions such as bore, stroke, speed, and mean effective pressures are equal, a two-stroke/cycle diesel engine will develop approximately（）Athe same indicated horsepower as a four-stroke/cycle engineBtwice the indicated horsepower as a four-stroke/cycle engineCone half indicated horsepower as a four-stroke/cycle engineDone power stroke for every two crankshaft revolutions
单选题Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）Abearing pressure in a four-stroke/cycle acting single diesel engine is continually reversedBbearing pressure in a two-stroke/cycle single acting diesel engine is continually reversedCthe maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engineDtwo-stoke/cycle diesel engines require more complicated lubrication piping
单选题The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speedIn maintaining this relationship, the camshaft drive causes the camshaft to rotate at（）Aone half crankshaft speed in a two-stroke cycle diesel engineBcrankshaft speed in a two-stroke cycle diesel engineCtwo times crankshaft speed in a two-stroke cycle diesel engineDone-fourth times crankshaft speed in a four-stroke cycle diesel engine
单选题The size of the exhaust valve opening is （）Amost critical in a four-stroke cycle diesel engineBmost critical in a two-stroke/cycle diesel engineCmost critical in a four-stroke/cycle diesel engine if it is turbochargedDof equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
单选题Which of the following statements is true regarding the installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?（）AIn a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greaterBSome provision must be made in a two-stroke/cycle engine to keep the rings from binding in the portsCNo gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engineDThe gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine
单选题Which of the following is true according to the passage?AMan's energy cycle can be changed easily.BSome family quarrels are caused by unawareness of energy cycle.CGetting up early in the morning is not easy.DEveryone has a daily energy cycle but a lazy one.
单选题In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.Atwo crankshaft revolutions in a two-stroke/cycle engineBtwo power strokes in a two-stroke/cycle engineCone power stroke in a two-stroke/cycle engineDtwo piston strokes in a two-stroke/cycle engine