two level subroutine 二级子程序

one-level subroutine 一级子程序 ; 一级子例行程序

two-level subroutine 二阶次例程

interrupt level subroutine [计] 中断级子程序

multiple-level subroutine call [计] 多级子程序调用

multiple level subroutine call 多级子程序调用

one level subroutine 一级子程序

subroutine level [计] 子程序级

multiple subroutine level 多子程序级

subroutine one-level 一阶次例程