临床上涎石病最常见于
A．颌下腺腺体
B．腮腺导管
C．颌下腺导管
D．腮腺腺体与导管交界
E．以上都不是
参考答案：C
China’s growth is not _____ threat to others. On _____ contrary, it will bring more opportunities to the world.
A．a; /
B．/; the
C．the; /
D．a; the
留置导尿管超过3d后，菌尿的发生率是
A．30%B．50%C．60%D．80%E．90%
