复式梯形断面
duplex trapezoidal section
梯形断面
trapezoidal section
trapezoid cross section
trapezoidal cross-section
Trapezdoidal section
trapezia section
梯形断面排水沟
channel with trapezoidal section
梯形断面曲杆
Curved member with trapezoid section
纵断面线形
longitudinal section alignment
vertical alignment
前体水线面面积系数
forebody waterplane coefficient
水翼小水线面面积船
hydrofoil small waterplane area ship
曲线梯形分布
curvilinear trapezoid distribution
双线梯形螺纹
double-line trapezoidal thread