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单项选择题

In order to properly design a beam, it is import to know the variation of (               ) and (                ) along its axis in order to find the points where these values are a maximum.

A．the shear, bending moment
B．the axial force, torsional moment
C．the shear, torsional moment
D．the axial force, bending moment

问答题

逆水行舟，不进则退什么意思？逆水行舟，不进则退怎么读？