该患者可能的诊断是
A．右髋前脱位B．右髋后脱位C．右粗隆间骨折D．右髋软组织损伤E．右股骨颈骨折
参考答案：E
E-mail, as well as telephones, _____ an important part in daily communication. [ ]
A. is being played
B. are playing
C. have played
D. is playing
为后牙铸造金属全冠做牙体预备时，错误的做法是（）
A．邻面聚合角以2°～5°为宜
B．各轴面角的线角磨圆钝
C．面磨除一般为0.5～1.0mm
D．上颌牙舌尖斜面不必多磨
E．颈部预备凹形肩台
面磨除一般为0.5～1.0mm