A:t=0时,x=﹣2m处的质点振动方向向上
B:t=0.175s时,x=﹣1m处的质点处在波谷位置
C:t=0.175s时,x=1m处的质点处在波峰位置
D:波速大小为10m/s
在1895年到1898年间,康有为多次上书光绪帝。这一时期康有为上书的主题应是 ( )
(Ⅰ)求C的大小
(Ⅱ)若AB=3,AC= 6 ,求p的值.
完形填空
Li Lei has a good friend. 1 name is Jim. He is 2 the USA. He likes 3 food very much. He can 4 English and 5 Chinese. Li Lei and Jim are in the same(相同的) 6 . They are classmates(同学). They go to school five 7 a week. They stay 8 home on Saturdays and Sundays. At school they play 9 after class. They like swimming, 10 .