金属烤瓷冠的舌侧一般是

A．刃状边缘
B．凿状边缘
C．凹形边缘
D．肩台形边缘
E．带斜面凹形边缘

Where can you probably see the sign that means "NO PHOTOS"? [ ]

A. In the hospital.

B. In the museum.

C. In the school.

D. In the library.