β平面[近似]
plane (approximation
beta-plane (approximation
β-苯基萘型平面化合物
Phenylnapthalene type planar commpounds
z平面均值扣除法
the removal of z-plane mean value
Y型平面六角铁氧体
Y type planar hexagonal ferrite
Y type hexaferrite
Y-type hexaferrites
R-X阻抗圆平面
R-X impedance round plane