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

A．to be fitted

B．fitted

C．fitting

D．to have been fitted

按照《建筑法》规定，鼓励企业为（）办理意外伤害保险，支付保险费。

A.从事危险作业的职工

B.现场施工人员

C.全体职工

D.特种作业操作人员