accounting education accounting experiment experiment teaching system
Einstein-Podolsky- Rosen thought experiment (EPR thought experiment)
airwater pipeline trenching sled
bucket trenching machine
ditching and trenching machine
hoe-type trenching machine
Hydraulic Grab Trenching
pullstroke trenching machine
trenching
挖渠道
重吊钻具
挖沟工作
探槽
深槽
挖沟
开沟
成槽
槽探
挖沟勘探
trenching by concussing and splitting