压力容器投用后的首次内外部检验周期一般为( )。
A．1年B．2年C．3年D．6年
参考答案：C
She _______ a German. She ________ him for three years.[ ]
A. married; has married with
B. married; has married
C. married to; has been married
D. married; has been married to
远程授权系统分为()三个功能端。
A、申请端
B、授权端
C、管理端
D、运营端
