调车领导人与谁必须亲自交接计划？
参考答案：
调车领导人与调车指挥人必须亲自交接计划。
---- It is the second time that I _________ to Shanghai.
----- What great changes! It’s ten years since I _______ there last time.
A．have been; went
B．had been; went
C．am; had been
D．come; had been
声振诊断中，振动的基本参数有（）
A.时间
B.振幅
C.频率
D.相位
