拔除右侧下颌垂直阻生牙时医生应站在
A.病员右前方
B.病员左前方
C.病员右后方
D.病员左后方
E.以上均可
参考答案:C
All morning as she waited for the medical report from the doctor, her nervousness ________.
A.has grown
B.is growing
C.grew
D.had grown
探头内吸收块的作用是()。
A、防止产生杂波
B、使脉冲变窄
C、使盲区变小
D、以上都是