访问8031片外数据存储器MOVX指令采用的是（）寻址方式。访问片外程序存储器MOVC指令采用的是（）寻址方式。

MCS—51单片机指令系统中共有111条指令，有六种寻址方式，分别是：（）寻址、（）寻址、（）寻址、（）寻址、（）寻址、（）寻址及（）寻址。

设a=′′a′′，b=′′b′′，c=′′c′′，d=′′d′′，执行语句x=IIf（（ad），′′A′′，′′B′′）后，x的值为（　　）。

试说明OR DX，-35[BX][DI]指令中源操作数和目的操作数使用的寻址方式。

ANB指令是（）指令，ORB是（）指令，与and、or指令不同。

Project（71）is an uncertain event or condition that，if it occurs，has a positive or a negative effect on at least one project objective，such as time，cost，scope，or quality．

● Project（71）is an uncertain event or condition that, if it occurs, has a positive or a negative effect on at least one project objective, such as time, cost, scope, or quality.（71）

 ______ twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.

It will be a relief over the death of a friend or a relative if the friend or relative dies from ______.

A mark or place at which a vessel comes under obligatory entry，transit，or escort procedure is know as（）.

简述80C51单片机指令系统的特点及寻址方式。

With techniques for running applications on most PC, you can ( ) a desktop icon or select the application from a menu.