伪指令在源程序中的作用是为完成汇编程序作各种准备工作的，这些伪指令仅在汇编过程中起作用，一旦汇编结束，伪指令的使命就完成。-Pseudo-instruction in the role of source code is compiled for the completion of preparatory work for a variety of procedures, these pseudo-instruction only play a role in the compilation p