工学 膳食调查 释 specific proposed levels; SPL 特定建议值 膳食中具有改善人体生理功能的成分有利于维护人体健康所应达到的摄入量。 工学 声压级 释 sound pressure level; SPL 声压级 用来表示声音的强弱，以对数尺衡量有效声压相对于一个基准值大小的物理量。
软件工程 释文 software product line, SPL 软件产品线
- frequency modulation and control
- frequency modulation and demodulation
- frequency modulation, FM
- frequency modulation laser
- frequency-modulation laser interferometry
- frequency modulation of hydro-generator unit
- frequency modulation radar
- frequency modulation radio
- frequency modulation screening
- frequency modulator
- frequency multiplication
- frequency multiplier
- frequency number
- frequency of access
- frequency of alternating current
- frequency of an event
- frequency of an oscillation
- frequency of a wave
- frequency of disease occurrence
- frequency offset
- frequency of language constituents
- frequency of occurrence
- frequency of operation
- frequency of samples
- frequency of urinatior