laser inside diameter measuring instrument,激光內徑測量儀

laser interferometer,激光干涉儀

laser interferometry,激光干涉測量

laser length measuring instrument,激光式測長儀

laser level,激光水准儀

laser microspectral analyzer,激光顯微光譜分析儀

laser orientation instrument,激光指向儀

laser outside diameter measuring instrument,激光外徑測量儀

laser plummet,激光垂准儀

laser printer,激光印刷机

laser probe mass spectrometer,激光探針質譜計

laser scatterometer,激光散射計

laser sensor,激光傳感器

laser spectrum radiator,激光光譜輻射計

laser tachometer,激光轉速儀

laser theodolite,激光經緯儀

latent heat,潛熱

lateral logger,側向測井儀

lateral probe movement,左右掃查

lateral scan,左右掃查

lead capacitance,接線電容

lead compensation,超前補償

lead inductance,接線電感

lead/lag module,超前/滯后組件

lead module,超前組件

lead network,超前网絡

leading edge,前緣

leading peak,前伸峰

leak pressure,泄漏壓力

leakage current screen,泄漏電流屏蔽

leakage magnetic field,漏磁場

leakage magnetic field inspection,漏磁探傷法

leakage magnetic flow detector,漏磁探傷儀

leakage resistance,漏電阻

least-squares line,最小二乘直線

least-squares linearity,最小二乘線性度

length,長度 length control device,定長裝置

length of a scale division,標度分格間距；分格（度）長度

lengthy bellows,長波紋管

lens micrometer,透鏡測微器

level,水准儀；水准器；水准泡；級；電平；物位

level recorder,電平記錄儀

level transducer(sensor),物位傳感器

leve-braked motor,杠杆式制動電動机

lever-type vibrograph,杠杆式測振儀

library,程序庫

library searching,譜庫檢索

life,壽命

life of X-ray tube,X射線管壽命試驗

lift of hydrofoil,水翼升力

lift-drag of towed vehicle,拖曳体升阻比

lift-off effect,提高效應

ligand chromatography,配位体色譜法

light button,光按鈕

light digital logging instrument,輕便數字測井儀

lightning,閃電

limit alarm sensor,极限報警檢測器

limit equivalent conductance,极限當量電導

limit frequency,极限頻率

limit of detection,檢測限

limit of intrinsic error,基本誤差限

limit resolution,极限分辨率

limit switch,限位開關

limited breathing enclosure,限制通气外殼

limited current,极限電流

limiting availability,极限可用度

limiting control,极限控制

limiting effective wavelength,极限有效波長

limiting operationg condition,极限工作條件

limiting temperature,极限溫度

limiting vacuum,极限真空度

limiting value for operation,工作极限值

limiting value for storage,貯存极限值

limiting value for transport,運輸极限值

limits of error,誤差（极）限

limits of operating error,工作誤差根限

line,線路

line-at-time printer,行式印刷机[打印机]；一次一行印刷机

line-by-line scanning,面掃描

line coupler,線路耦合器

line focus,線焦點

line frame,線路幀

line pair,線對

line printer,行式打印机[印刷机]；一次一行印刷机

line protocol,線路協議

line scanning,線掃描

line sensitivity,線靈敏度

line strain,線應變

line to line resolution,線分辨力

line turnaround,線路換向

line voltage regulation,電源電壓調整率

linear absorption coefticient,線性吸收系數

linear acceleration,線加速度

linear acceleration transducer[sensor],線加速度傳感器

linear array,線陣

linear control system,線性控制系統

linear control system theory,線性控制系統理論

linear conversion,線性轉換