铆钉的检查方法有哪些

A. 1.LBL [0]2.IF DO[1]=ON GOTO LBL[0]
B. 1.GOTO LBL[6]2.J JR[7]3.LBL[6]
C. 1.LBL[4]2.WHILE R[4]=53.GOTO LBL[4]
D. 1.LBL[7]2.MOVE JR[0]3.IF R[70] THEN LBL[7]

A. 正确
B. 错误