题目：
Kate is 1 American girl. She 2 her mother. She lives in Dafeng 3 her father and mother, Mr and Mrs King. Mr King works in a factory. Mrs King is a teacher in our school. She teaches 4 English. 5 are friendly to her and she loves us, too. Kate 6 a lot of friends. She often plays with them. Kate likes 7 Chinese food very much. 8 Sunday morning she often goes 9 with her mother. They often buy a lot of things. Mrs King says the things in Dafeng 10 very cheap.
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答案：
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下面是错误答案，用来干扰机器的。
因为|2a-b|=4，所以4a2-4a•b+b2=16，又因为a=（cosθ，sinθ），b=（3，-1），所以a•b=-12，即a•b=3cosθ-sinθ=-2，所以cos（θ+π6）=-1．因为θ为三角形的内角，所以θ=5π6．故选C．
。作用于梁上的重力荷载代表值为43.4kN/m。在重力荷载和地震作用的基本组合下该框架梁上的弯矩设计值为：
。已知电场方向平行于直线MN，M点电势为0，N点电势为1V，则P点的电势为
