mass number,質量數

mass peak,質量峰

mass range,質量范圍

mass scanning,質量掃描

mass spectometric analysis,質譜法

mass spectrograph,質譜儀

mass spectrometer,質譜計

mass spectrometry(MS),質譜學；質譜法

mass spectrometry-mass spectrometry(MS-MS),質譜-質譜法

mass spectroscope,質譜儀器

mass spectroscopy,質譜學

mass spectrum,質譜

mass stability,質量穩定性

mass storage,大容量存儲器；海量存儲器

mass,質量

mass-spring system,質量彈簧系統

mass-to-charge ratio,質荷比

master file,主文卷

master station,主站

master viscometer,標准粘度計

master/slave discrimination,主從鑒別；主副鑒別

material measure,實体量器

material processibility,材料工藝性能

material tesing machine,材料試驗机

mathematical model,數學模型

mathematical similarity,數學相似

mathematical simulation,數字仿真

matrix correction,基本修正

matrix effect,基体效應

matrix printer,點陣印刷机；點陣打印机

Mattauch-Herzog geometry(mass spectrograph),馬-赫型雙聚焦質譜法

max allowable continuous working current,最大允許連續工作電流

max deflection of linearity,最大線性偏轉

maximum acceleration,最大加速度

maximum allowde deviation,最大允許扁差

maximum ballistic scanning,最大衝擊拂掠

maximum capacity,最大稱量

maximum cyclic load,最大循環負荷

maximum cyclic stress,最大循環應力

maximum displacement,最大位移

maximum excitation,最大激勵

maximum floating voltage,最大浮置電壓

maximum flow-rate,最大流量

maximum load of the test,最大試驗負荷

maximum load of the testing machine,試驗机最大負荷

maximum operating pressure differential,最大工作壓差

maximum operationg water depth,最大工作（水）深度

maximum output inductance,最大輸出電感

maximum output resistance,最大輸出電阻

maximum overshoot,最大超調量

maximum peneration power,最大穿透力

maximum power supply voltage,最高電源電壓

maximum principle,极大值原理；最大值原理

maximum profit programming,最大利潤規划

maximum rated circumferential magnetizing current, 額定周向磁化電流；最大周向磁化電流

maximum rated force under sinusoidal conditions,正弦態最大激振力

maximum revolutions of output shaft,輸出軸最大轉數

maximum scale alue,標度終點值

maximum sound pressure level of microphone,傳聲器最高聲壓級

maximum strain,最大應變

maximum temperature,最高溫度

maximum thermometer,最高溫度計；最高溫度表

maximum transverse load,最大橫向負荷

maximum velocity,最大速度

maximum wind speed,最大風速

maximum working pressure(MWP),最大工作壓力

McLeod vacuum gauge,麥氏真空計

mean availability,平均軸就流体速度

mean dynamic pressure in a cross-section,橫截面內的平均動壓

mean flow-rate,平均流量

mean life,平均壽命

mean linear velocity of mobile phase,流動相平均線速

mean load,平均負荷

mean repair time(MRT),平均修理時間

mean squared spectral density,均方譜密度

mean strain,平均應變

mean stress,平均應力

mean time between failures(MTBF),平均失效間隔時間

mean time to failure(MTTF),平均失效前時間

mean time to restoration,平均体膨脹系數

meantime auto-spectrometer,同時式自動光譜儀

measurand,被測量

measured object,被測對象

measured quantiry,被測量

measured variable,被測變量

measurement hardware,測量硬件

measurement of directional response pattern,指向性響應圖案測量

measurement of exciting force,激振力的測量

measurement of vibration quantity,振動量的測量

measurement procedure,測量步驟

measurement signal,測量信號

measurement standand,測量標准（器）

measurement time,測量時間

measurement,測量

measuring amplifier,測量放大器

measuring bridge,測量電橋

measuring current transformer,測量用電流互感器

measuring distance,測量距离

measuring element(of an electro-mechanical measuring instrument), （電-机械測量儀表的）測量机构

measuring equipment,測量裝置；測量設備

measuring hole,測量孔

measuring indication system,測量指示裝置

measuring instrument with circuit control device,帶有電路控制器件的測量儀表

measuring instrument,測量（儀器）儀表；測量器具

measuring junction,測量端區

measuring microphone,測試傳聲器

measuring plane,測量平面

measuring point for the humidity,濕度測定點

measuring point for the temperature,溫度測定點

measuring range higher limit,測量范圍上限值

measuring range lower limit,測量范圍下限值

measuring range,測量范圍

measuring section,測量段

measuring spark gap,測量球隙

measuring system,測量系統

measuring terminal,測量端

measuring time,測量時間

measuring transducer(with electrical output),（電量輸出）測量變換器

measuring voltage transformer,測量用電壓互感器

mechanical bathythermograph(MBT),机械式深溫計

mechanical hygrometer,机械濕度計

mechanical impedance,机械阻抗

mechanical properties,机械性能

mechanical quantity transducer[sensor],力學量傳感器

mechanical quantity,机械量

mechanical regulator,机械穩速器

mechanical resonance frequency of the moving element suspension, 運動部件懸挂机械共振頻率

mechanical resonance frequency of the moving element,運動部件机械共振頻率

mechanical resonance,机械共振

mechanical runout,机械脫出

mechanical sensor,力敏元件

mechanical shock,机械衝擊

mechanical strain,机械應變

mechanical structure type transducer[sensor],結构型傳感器

mechanical test,机械性能試驗

mechanical testing machine,机械式試驗机

mechanical top-loading balance,机械式上皿天平

mechanical vibraometer,机械測振儀

mechanical vibration,(机械）振動

mechanical vibrator,机械振動器

mechanical zero adjuxter,机械零位調節器

mechanical zero,机械零位

mechanism model,机理模型

medium temperature strain gauge,中溫應變計（片）

mel,美（音調的單位）

melted quartz cqpacitor,熔融石英電容器

melting heat,熔解熱

melting point type disposable fever thermeometer,熔點型消耗式溫度計