多项选择题

大指“托”的两个基本弹奏方法是( )
A 提弹法
B 夹弹法
C 扫摇法
D 点奏法

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不定项选择

土壤pH一般是指土壤的总酸度。

A．正确
B．错误

单项选择题

Due to ( ) of shear, the linear shear stress distribution within the plane of the cross section is also distributed along an adjacent ( ) of the shaft

A．equilibrium equation; axial plane
B．compatibility condition; axial plane
C．linear distribution; axial plane
D．complementary property; axial plane