All the people in the nation can remember exactly how many years ago _______ the civil war broke out.

A．was it that

B．it was when

C．it was that

D．was it when

对放射工作场所，用人单位必须配置防护设备和报警装置，保证接触放射线的工作人员佩戴（）

A.安全帽

B.防护眼镜

C.危险作业标识

D.个人剂量计、个人防护用品

E.防护面罩