Every device ______in the plane must be designed and made with great care so as to make sure that nothing goes wrong in operation.

A．fitted

B．to be fitted

C．fitting

D．being fitted

已知∠1=48°，∠2的两边分别与∠1的两边垂直，则∠2=（　）

A．48°

B．132°

C．42°

D．48°或132°