超音波法液位元元元元元元测定
ultra-sonic method of liquid meaduremert
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
公路平面线形设计
design of plane alignment of highway