A.
B.
C.
D.
[单选题]A.B.C.D.
[单选题]A.π/3B.π/6C.-π/3D.-π/6
[单选题]A.慢性牙周炎B.快速进展型牙周炎C.青少年牙周炎D.急性坏死性龈炎E.多发性牙周脓肿