【电】 二阶二次常式

second-order subroutine【计】;secondary subroutine【计】;two-level subroutine【计】

two-level controller with overlap【自】;two-step controller with overlap【自】

secondary memory【计】;secondary storage【计】;two-level storage【计】

two-level laser

two-level subroutine【计】

two-level encoding microinstruction

two-level addressing【计】

second-level address【计】;two-level address【计】