He left his hometown _______ a cold winter morning.[ ]
A. on
B. of
C. in
D. at
答案:A
电诊法检查牙髓活力应该()
A.先测患牙
B.先测对照牙
C.对照牙可任意挑选
D.死髓牙可做对照牙
E.无髓牙可做对照牙
标准状态下,760mm水银柱高等于()百帕。
A.1013.15
B.1013.25
C.1013.35
D.1013.45