在編目或流內過(guò)程中使用的一種作業(yè)控制語(yǔ)句，可用來(lái)對包含在過(guò)程中的符號參數賦予系統設定值。對流內過(guò)程，用來(lái)標志過(guò)程的開(kāi)始。
A job control statement used in cataloged or in-stream procedures. It can be used to assign default values for symbolic parameters contained in a procedure. For in-stream procedures, it is used to mark the beginning of the procedure.
氨氣、煤焦油、焦煤都是煤氣生產(chǎn)過(guò)程中的副產(chǎn)品。
Ammonia, coal tar and coke are all by-products obtained in the manufacture of coal gas.
