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问答题Directions:Complete the following paragraph by choosing one statement from the column below. (1)_____________________________________________. Where Britons end certain words with -se Americans usually end the same words with -ce (British practise vs. American practice); (2)________________________ (British defence vs. American defense). Notice also the British preference for final -re over the American -er (metre vs. meter). Finally most Americans consider neighbor a correct spelling, (3)________________________ and spells it in another way. A. but a Briton characteristically adds a u B. but American spelling prevails among the youth C. Minor differences exist between American and British spelling D. the reverse is sometimes true, too 请将答案序号按照题号顺序写在下面横线上。答案之间用空格隔开。 _______________________

单项选择题为了由平面应变问题的物理方程得到平面应力问题的物理方程，只需将弹性模量换为，泊松比换为即可。（ ）