笔直向前作业
straight forward operation
差分式前置放大器
differential preamplifier
发动机前置式客车
all wheel drive automobile
bus with front engine
前置式洞口工法
AECM
advanced entrance construction method
前置式空气预热器
frontlocated air preheater
前置式口令检查
proactive password analysis
前置式喷雾加湿风机
pre-spraying adding humidify fan