A.efine或include
B.ifdef或include
C.indef或ifndef或define
D.ifdef或ifndef或if
A.C51单片机头文件,定义了8051所有特殊寄存器地址,是必须要带的
B.老师自己编写的头文件
C.STC单片机头文件,定义了8051特殊寄存器,不是必须的
D.STC单片机的所有寄存器地址
A.include_directories()
B.include_directory()
C.cmake_include_path()
D.cmake_include_directory()