圆角矩形风管
round corner rectangle air duct
当量
Equivalent
equivalence
Yield
Normal
equivalents
diameter
Dose
Coefficient
Equal
normality
valent
equal quantity
equirvalent
equivalent weight
associative axiom of multiplication
E
valent weight
equivalent section
equivalent quantity
equivalent weigth
N normal
coefficient of equivalent
elequivalent weight
equivalent time sampling
Evaluation of equivalent
Epuivalent
风管制安
wind making and installing
钻具连接油管的接头
tools to tubing substitute
通风管路基
Ventilation pipe subgrade
ventiduct roadbed
关于玻璃热管的探讨
Discussion on Heat Tube made of Glass
通风管路堤
ventilation pipe embankment