网友您好, 请在下方输入框内输入要搜索的题目:

题目内容 (请给出正确答案)

根据流动管道内所处的流动状态具有不同的摩擦阻力系数。There are different friction resistance coefficients according to the flow state in the flow pipe.


参考答案和解析
A
更多 “根据流动管道内所处的流动状态具有不同的摩擦阻力系数。There are different friction resistance coefficients according to the flow state in the flow pipe.” 相关考题
考题 气体在管道内流动时,为了克服摩擦阻力而造成的能量损失叫做()。

考题 管道内流动的介质性质不同对管道的作用力也不同,下面 ( )不可能是引起管道振动的振源。A、管道内介质流动的流体不稳定;B、管道内介质为汽液两相流;C、管道中流动的介质向外界散热;D、管道阀门缓慢关闭或打开

考题 If you install a new hydraulic hose in a hydraulic system, the hose must be long enough to allow for contraction to preventA.failure of the hydraulic hoseB.excessive flow through the lineC.friction in other areas of the hydraulic systemD.overheating of the hydraulic fluid

考题 流体在管道内的流动阻力分为什么?( )A.沿程阻力;B.局部阻力;C.水力阻力;D.摩擦阻力;

考题 What Netflow component can be applied to an interface to track IPv4 traffic?() A.flow monitorB.flow recordC.flow samplerD.flow

考题 When referring to dry bulk cargoes,the term "flow state" ______.A.designates the state of a commodity when the ship is heeled past the angle of reposeB.relates to the suitability of loading a cargo by flowing down inclined chutesC.refers to the saturation of a dry bulk product with water to the point where it acts as a liquidD.relates to the minimum granule size of a particular product where it will flow like a liquid at an angle of 30°

考题 色谱法按流动相所处的状态不同,可分为()色谱和()色谱。

考题 污泥在管道内的流动状态和水在管道内的流动状态基本相同,污泥的流动阻力随其流速的变化而变化。

考题 能量流动(Energy Flow)

考题 与GPRS移动终端有对应关系的标识:()A、Temporary Flow IdentityB、Uplink State FlagC、Temporary Logical Link Identity(TLLI)D、Skip Indicator

考题 以下哪个标识不是出现在GPRS无线部分的信令流程内()A、Temporary Flow Identity (TFI)B、Uplink State Flag (USF)C、Temporary Logical Link Identity (TLLI)D、Tunnel Identifier (TID)

考题 What Netflow component can be applied to an interface to track IPv4 traffic?()A、flow monitorB、flow recordC、flow samplerD、flow

考题 What are the four vPath packet flow steps? ()A、 perform flow lookupsB、 intercept packets on service enabled portsC、 run packets through the vPath flow managerD、 classify the packetsE、 flow manager emits an action for the packetsF、 enforce the action determined by the flow manager

考题 不可压缩流体在不同的管道内流动过程中,可认为其什么是不变的?()A、密度B、流速C、阻力D、摩擦阻力

考题 单选题According to the passage, scientists can’t observe some of the earliest steps in brain activity becausee.A those changes are subtle and masked by some reactionsB subtle changes in blood flow began earlierC the imaging techniques are out of placeD the flow of blood to increase to an area of the brain is slow

考题 单选题Pressure in an operating hydraulic system is developed ().A only by the pump as its primary functionB by resistance to the fluid flow through the systemC by the thermal input to the systems fluidD solely by the charge applied by the accumulators

考题 单选题An ammeter should be used to measure ()A the voltage between two points in a circuitB circuit continuityC current flow in a circuitD total or partial circuit resistance

考题 单选题If the resistance of a circuit is cut in half and the applied voltage is kept constant, the current flow will be ().A doubledB quadrupledC unchangedD cut in half

考题 单选题The main function of piston compression rings is to ()A prevent excessive cylinder liner wearB reduce friction losses in the engineC seal the space between the piston and the linerD limit upward flow of lube oil into the combustion space

考题 单选题With respect to diesel fuel, the ease with which a cold engine will start is dependent upon the()A ignition quality of the fuelB high heating value of the fuelC amount of carbon residue after combustionD internal flow resistance in the injectors

考题 单选题Which of the following statements is true concerning simple parallel resistance circuits?()A The total current flow equals the sum of the individual currentsB The total current flow equals the reciprocal of the sum of the individual currentsC The total resistance equals the sum of the individual resistanceD The total voltage equals the sum of the individual voltages across each resistance

考题 单选题管道内流动的介质性质不同对管道的作力也不同,下面()不可能是引起管道振动的振源。A 管道内介质流动的流体不稳定B 管道内介质为汽液两相流C 管道中流动的介质向外界散热D 管道阀门缓慢关闭或打开

考题 单选题When the voltage remains constant and the resistance is increased in a series circuit, the flow of current ()A increases by the square of the original valueB increasesC remains the sameD decreases

考题 单选题According to the passage, why couldn’t PET and functional M. R. I. scans detect subtle changes in blood flow earlier?A Because there is early oxygen transfer.B Because they do not form their images quickly enough to follow such rapid changes.C Because researchers control the changes in blood flow.D Because early oxygen transfer gives the flow blood energy.

考题 名词解释题能量流动(Energy Flow)

考题 单选题Which of the following statements concerning a simple parallel resistance circuit is correct?()A The voltage drop across each resistor is the sameB The total current flow equals the reciprocal of the sum of the individual currentsC The total resistance equals the sum of the individual resistancesD The total voltage equals the sum of the individual voltages across each resistance

考题 单选题When referring to dry bulk cargoes,the term “flow state”().A designates the state of a commodity when the ship is heeled past the angle of reposeB relates to the suitability of loading a cargo by flowing down inclined chutesC refers to the saturation of a dry bulk product with water to the point where it acts as a liquidD relates to the minimum granule size of a particular product where it will flow like a liquid at an angle of 30°

考题 单选题In the piping systems of a vessel,what type of valve gives the least resistance to fluid flow when fully open?().A Globe valveB Butterfly valveC Gate valveD Packless valve