阅读下列程序段: DATA SEGMENT STR DB 99,100 DUP () DATA ENDS CODE SEGMENT ASSUME DS:DATA,
阅读下列程序段: DATA SEGMENT STR DB 99,100 DUP () DATA ENDS CODE SEGMENT ASSUME DS:DATA, CS:CODE START: ...... MOV DX, OFFSET STR MOV AH,0AH INT 21H MOV CH,STR+1 MOV CL,STR+2 ...... CODE ENDS END START 此段程序执行后,从键盘输入字符串‘ABCDEFG’,则CH和CL分别是什么?