在控制等级中，TCS是PLC的下级
正确
暂无解析
Rock:______.
Sharon:Verywell,andtheexperimentisnearlyfinished.
Didyouattendthemeetingyesterday____Marytalkedalot?
Tammy:Someoneisatthedoctor.
Richard:______.
Theday____(在那天我第一次遇见他)wasthefirstofMayontheGreatWall.
Hedidn'tknowwhichroom____.
