单选题The upper section of a piston is called the （）AlandBskirtCcrownDplate
单选题
The upper section of a piston is called the （）
A
land
B
skirt
C
crown
D
plate
参考解析
解析：
暂无解析
相关考题：
The lowest temperature at which the vapor formed from a liquid ignites and continues to burn steadily in the presence of an ignition source is called the( ). A.flash pointB.fire pointC.upper explosive limitD.lower explosive hmlt
The statement of cash flows consists of an operating section, an income section, and an equity section.()
Piston cooling fins are locatedA.atop the piston crownB.beneath the piston crownC.at the base of the piston skirtD.inside the cylinder liner cooling water jacket
The upper piston rings m large, slow-speed, two-stroke/cycle diesel engines are most effectively lubricated by oil ____.A.fed from mechanical lubricatorsB.thrown off from the main bearingsC.supplied from wick fed drip lubricatorsD.flow from a centrifugal or banjo oiler
On a hydrocarbon flammability chart the line which extends from 0% to 21.8% oxygen，lying tangent to the flammability range，is called the ______．A.minimum oxygen content lineB.critical displacement lineC.critical dilution lineD.upper threshold limit
The system of valves and cargo lines in the bottom piping network of a tanker that connects one section of cargo tanks to another section is called a ______．A.come-alongB.crossoverC.manifoldD.runaround
The section of each end of a barge which is heavily reinforced to take the pressure of pushing is called the ______．A.HeadlogB.TowheadC.Collision bulkheadD.Bullnose
The deck from bow to stern is called the （）(主甲板).A、main deckB、tweendeckC、upper deckD、lower deck
从船艏贯穿至船艉的甲板叫主甲板。（）A、The deck from bow to stern is called the main deck.B、The deck from stern to bow is called the tweendeck.C、The deck from bow to stern is called the upper deck.D、The deck from stern to bow is called the lower deck.
单选题Securing cargo by running timbers from an upper support down to the cargo，either vertically or at an angle，is called（）.AbracesBdunnageCshoresDtoms
单选题The diameter of a piston is usually less at the crown than at the skirt, in order to （）.Afacilitate the installation of piston ringsBallow for the expansion of the piston during operationCprevent crankcase vapors from entering the combustion chamberDreduce wearing of the upper cylinder liner
单选题The system of valves and cargo lines in the bottom piping network of a tank vessel that connects one section of cargo tanks to another section is called a（）.AcrossoverBrunaroundCcome-alongDmanifold
单选题The foremost part of the upper deck is called the（）.AforecastleBtweendeckChatchesDpeak tanks
单选题The clearance volume for a single stage compressor is defined as the space created between the （）.Atop of the piston and bottom side of head, with the piston at BDCBpiston and head, including the space around the piston to the top of the upper ring and under the valves, with the piston at TDCCbottom of the piston and bottom side of the head at TDC, regardless of upper ring location and valve placementDtop of the piston and bottom side of the head at TDC as compared to that which exists between the top of the piston and bottom side of head at BDC
单选题The main purpose of the piston oil scraper rings is to （）.Aseal the space between the piston and the linerBreduce the amount of lube oil burned in the combustion chamberCtransmit heat from the piston to the cylinder linerDdamp out fluctuations of the piston side thrust
单选题The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.Aso a heightBsuch a heightCso highDsuch high
单选题The cast iron guide-ways for （） are attached to the top section and seal off the crankcase.Athe connecting rodBthe cross-headCthe piston rodDthe air box
单选题Which of the following statements concerning cylinder liner wear is true?（）ALiner wear is distributed equally between the upper and lower portions of the cylinderBExcessive liner wear causes wear between piston ring and grooveCExcessive, but uniform liner wear will not cause wear between piston ring and grooveDLiner wear is normally greatest in the middle of the cylinder
单选题If due to thick and hard deposits of carbon, the piston rings cannot move freely in their grooves, dark areas will often appear on the upper part of the cylinder wall (may not be the risible at port inspection)What condition of the piston rings can result in this phenomenon?（）Amicro-seizureBstickingCscratchedDbreakage/ollapse
单选题The section of each end of a barge which is heavily reinforced to take the pressure of pushing is called the（）.AHeadlogBTowheadCCollision bulkheadDBullnose
单选题Piston cooling fins are located（）Aatop the piston crownBbeneath the piston crownCat the base of the piston skirtDinside the cylinder liner cooling water jacket
单选题从船艏贯穿至船艉的甲板叫主甲板。（）AThe deck from bow to stern is called the main deck.BThe deck from stern to bow is called the tweendeck.CThe deck from bow to stern is called the upper deck.DThe deck from stern to bow is called the lower deck.