A. reg51.h B. absacc.h C. io.h D. string.h
A. 0x00~0x7F B. 0x80~0xFF C. 0x20~0x2F D. 0x00~0x1F
A. bit B. String C. char D. int
A. 0 B. 1 C. true D. 0xFF
A. unsigned char code x=100; B. unsigned char data x= 100; C. unsigned char xdata x =100; D. unsigned char code x; x= 100;
A. unsigned int y; B. unsigned int data y; C. unsigned int xdata y; D. unsigned int bdata y;
A. 置1 B. 置0 C. 取反 D. 不变