pitch
(1)螺距，齿节间距
(2)沥青
(3)松鲁
(4)音调

• microfilm system
• microfission
• microflash
• microflip-flop
• microfluctuation
• microfluormetric determination
• microfluorometer
• microfluoroscope
• microfocus X-ray tube
• micro-galvanometer
• microgaph
• microgeometeric
• micrograph
• micrography
• microgroove recording
• microguide
• microhardness
• microhardness tester
• microhologam
• microholography
• microimage
• microimpurity
• microindicator
• micro interference filters
• microinterferometer