多项选择题

“一个是阆苑仙葩，一个是美玉无瑕。若说没奇缘，今生偏又遇着他；若说有奇缘，如何心事终虚化?”这首诗中的“阆苑仙葩”和“美玉无瑕”分别指的是哪两位人物？ A. 林黛玉 B. 薛宝钗 C. 贾宝玉 D. 妙玉

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单项选择题

Which of the following statements is not correct for curved beams?
A、All cross sections possess a vertical axis of symmetry lying in the plane of the centroidal axis
B、Sections originally plane and perpendicular to the centroidal beam axis remain so subsequent to bending
C、The curved beam is a solid of revolution, with its axis, inner and outer surfaces being circular arcs about the axis of revolution
D、The influence of transverse shear on beam deformation must be taken into account

多项选择题

能和声母s相拼合韵母有（）。A、uo、eB、ei、ueiC、en、uenD、ɑi、uɑiE、ɑn、ong