用计算器求sin20°+tan54°33′的结果等于（结果精确到0.01）（　　）

    My name is John Brown. I am a school boy. My school is 1my home. Every day it takes me a lot of time 2 there. The road is not good, so I can't 3my bike to school. I often take a bus there. It usually 4 me forty minutes to get there 5.I 6 at seven every morning. I have no time for breakfast at home. I often have something for breakfast on the bus 7 at school. I don't want to  8school. Some students in our school take buses to school. Some students walk to school 9 their homes are not far.10students ride bikes

如图所示是一交变电流的i﹣t图象，则该交变电流的有效值为（   ）

如图所示，在矩形ABCD中，E是BC的中点，AE=AD=2，则AC的长是（    ）