Differential needle valves used in fuel injectors are directly closed by（）

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• If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）

  A . have a larger than normal dead band B . produce excessive speed response to a load change C . respond slowly to any change in engine load D . stabilize engine speed at the new governor setting

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• 差异风化（differential weathering）

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• The needle valve will open when the fuel pressure acting on the needle valve （） exerts a sufficient force to overcome the spring compression.

  A . tape face B . tapered face C . surface D . thinner face

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• 鉴别培养基（differential medium）

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• differential-interference microscope（微分干涉显微镜）

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• 丙烷机启动后，在设定时间内，过滤器进出口差压超过HI START FILTER DIFFERENTIAL PRESS报警或关断值（）

  A . A、继续运行 B . B、关停 C . C、重新启动 D . D、报警运行

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• The needle valve in the injector （） at a pre-set pressure which ensures that the fuel will atomize once it enters the cylinder.

  A . will lift B . will be lifted C . will close D . will be closed

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• If the needle valve in a fuel injection nozzle sticks open （）.

  A . no fuel will be delivered through the nozzle B . the nozzle will overheat and crack C . time of injection will change D . fuel will leak into the drain line

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• The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.

  A . be jammed B . be opened C . be seated D . be broke

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• 圈干NEEDLE LOOP

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• Which of the fuel injection systems listed uses a spring loaded differential spray needle valve and individual pump for each cylinder?（）

  A . Common-rail injection B . Air injection C . Jerk pump injection D . Distribution injectio

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• 差分备份（Differential Backup）

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• 微分反应性 differential reactivity

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• You perform differential incremental level 1 backups of your database on each working day and level 0 backup on Sundays， to tape.  Which two statements are true about differential incremental backups（）

  A . The backup performed on Sundays contains all the blocks that have ever been used in the database. B . The backup performed on Sundays contains all the blocks that have changed since the last level 1backup.  C . The backup performed on each working day contains all the blocks that have changed since the lastlevel 0 backup. D . The backup performed on Monday contains all the blocks that have changed since the level 0 backup，and every other working day contains all the blocks that have changed since the level 1 backup.

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• You perform differential incremental level 1 backups of your database on each working day and level 0 backupon Sundays， to tape. Which two statements are true about differential incremental backups（）

  A . The backup performed on Sundays contains all the blocks that have ever been used in the database. B . The backup performed on Sundays contains all the blocks that have changed since the last level 1 backup. C . The backup performed on each working day contains all the blocks that have changed since the last level 0 backup. D . The backup performed on Monday contains all the blocks that have changed since the level 0 backup， and every other working day contains all the blocks that have changed since the level 1 backu

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• differential centrifugation （差速离心）

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• The pressure differential across a diesel engine lube oil system duplex filter should be checked to （）

  A . determine the need for filter cleaning B . measure any change in oil viscosity C . prevent damage to the filter D . determine the need for batch filtratio

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• Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at （）

  A . maximum power at a normal load B . maximum power and load under normal conditions C . half speed and normal temperature D . normal operating temperature without a load

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• An increased pressure differential between the inlet and outlet of a strainer usually indicates the strainer is （）

  A . holed B . fouled C . clean D . dry

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• 差异备份“教学管理”数据库BACKUP DATABASE 教学管理 TO DISK='D:教学管理系统差异备份.bak'ON DIFFERENTIAL

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• 原文:We've been on pins and needles waiting for you. 译文:我们一直在急切地盼着你来,如坐针毡。

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• Treatment by insertion of thin needles is

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• fine-needle aspiration biopsy

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• Insulin is usually taken assubcutaneous injections by single-useinsulin penswith disposable needles.（）

  是 否

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