梯形牌
An ancient stringed instrument similar to the lyre or zither but having a trapezoidal sounding board under the strings.
类似于七弦琴和筝但在琴弦下具有梯形的传声结构板的古代弦乐器。
UNBALANCE SHEAR FORCE DISTRIBUTION CALCULATION OF BRAKE CHAMBER OF ABOIDEAU WHICH WAS CONVERTED INTO TRAPEZOIDAL CROSS-SECTION Discussion on calculation of unbalanced cutting power distribution in the design of sluice bottom board structure
水闸闸室化算梯形横截面上不平衡剪力的分配计算闸底板结构设计中不平衡剪力分配计算问题的探讨
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