The auxiliary shaft topsoil adopted ordinary construction and drainages in hygrometric well.屯留煤矿副井井筒表土段采用普通法施工,利用井外降水井疏干降水.This causes environmental damage when the topsoil is washed away by the rains.雨水冲走表层土壤会造成环境破坏。The...
MC 14499 was the serial display driver of BCD input and decimal output.MC14499是一种BCD码输入-十进制码输出的串行显示驱动器.Of an electronic circuit or device; having an output proportional to input; amplifying or attenuating all frequencies...