C.PSW                                                                        D.SP

7.根据单片机能适应的环境温度范围可将单片机划分为三个等级，下列哪项不属于这三个等级

A.民用级                                                                    B.军用级

C.工业级                                                                     D.航天级

8.已知(CY)=1，(A)=1，则执行RLCA指令后，A的内容为

A.0                                                                               B.1

C.2                                                                               D.3

9.要读取单片机外部ROM中数据，则应该使用的指令操作码是

A.MOV                                                                       B.MOVC

C.MOVX                                                                    D.PUSH

10.在单片机的子程序中，最后一条指令必须是

A.RET                                                                         B.RETI

C.LCALL                                                                    D.ACALL

11.已知(SP)=20H，则执行PUSH ACC指令后，SP的值为

A.07H                                                                          B.19H

C.21H                                                           &