－Where did you put the car keys?

－Oh, I ______ I put them on the chair because the phone rang as I ______ in. [ ]

A. remembered; come

B. remembered; was coming

C. remember; come

D. remember; was coming

凸轮基圆半径的选择，需考虑到（）；（），以及凸轮的实际廓线是否出现变尖和失真等因素。