刷盒与换向器表面的距离应保持在1.5~3mm范围内。
参考答案：对
三叉神经下颌支通过
A．蝴蝶征B．靶征C．透明隔增厚征D．白质推挤征E．三角征
— Have you known him for a long time?
— Yes, since he ______ here after graduation.
[ ]
A. comes
B. came
C. has come
D. had come
