单项选择题

绕曲线方程主要反映了()

A.对近似微分方程误差的修正
B.剪力对变形的影响
C.约束条件对变形的影响
D.梁的轴向位移

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the history of australian literature dates back to the dreamtime stories，myths and legends that have been passed on orally or visually by artistic representations on rocks and on bark over 40 000 years. ()

答案：正确

单项选择题

厚壁玻璃杯因沸水倒入而发生破裂，裂纹起始于（）

A.内壁
B.外壁
C.壁厚中间
D.内外壁同时