平面变间距全息光栅
varied line spacing plane holographic grating
表面间平均体积测度
surface mean inter-space measure
surface mean inters-space measure
超平面距离
distance of the super plane
承压平面平衡
parting surface support balance
单一平面平衡机
single-plane (static) balancing machine
非定常平面平行运动
unsteady planar parallel flow
刚体平面平行运动
plane motion of rigid body
活塞环纵向[平面]间隙
piston ring axial clearance
近间距平行隧道
small spacing parallel tunnels