一患者前牙在正中咬合时,不能与对牙合牙发生接触而出现颌间间隙,有吮拇指习惯,可用以下矫正器()
A.舌刺
B.唇挡
C.舌屏
D.颊屏
E.斜面导板
参考答案:A, C
The photographer needs to charge up the digital camera every day as the battery _____ quickly. [ ]
A. shuts up
B. ends up
C. runs out
D. turns out
便携式卷线盘电源线长度不得超过()