题目

完形填空This is a photo of Mr. King’s family. Mr. and Mrs. King 1 two sons and a daughter. They are in England. Mrs. King is 2 Chinese teacher. Mr. King is a bus driver. 3 daughter is eleven and 4 is a student. Her name is Kathy. She is in Class Four 5 No. 1 Middle School. There are thirty students in her class. Tom and David 6 her brothers. They are nine years old. They are 7 . They are 8 , too. They go to school at 7: 30. They have 9 in the morning and two in the afternoon. Tom and David like 10 and they play it every day. They love their sister very much. 1. A. there are      B.8.对振荡电路,下列说法正确的是(  )A.振荡电路中、电容器充电或放电一次所用的时间为 π$\sqrt{LC}$B.振荡过程中,电容器极板间电场强度的变化周期为 2π$\sqrt{LC}$C.振荡电路中,电场能与磁场能的转化周期为2π$\sqrt{LC}$D.振荡过程中,线圈内磁感应强度的变化周期为2π$\sqrt{LC}$
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