竖式计算小数加减法与整数加减法的方法相同，都是末位对齐。[ ]
错误
A．(A) He is sometimes not on good terms with his parents.
B．(B) He wants to have control over his parents.
C．(C) He and his parents are not fond of each other.
D．(D) He and his parents have different views about family life.
射频技术兴起于（）
A、20世纪40年代
B、20世纪60年代
C、20世纪80年代
D、20世纪90年代
