弯制切牙卡环应充分考虑（）
A.固位
B.排牙
C.倒凹
D.就位和美观
E.导线
参考答案：D
—Listen! Is that Kate singing in the room?
—No. It _____ be Kate. She hasn't been back from Beijing yet. [ ]
A. must
B. can't
C. mustn't
水、电、卫等设备工程维修标准是什么？
