在微型计算机中,负数常用补码表示。( )

A. 对
B. 错

MCS-51的程序存贮器用于存放运算中间结果。( )

A. 对
B. 错

MCS-51单片机的数据存贮器是指外部存贮器。( )

A. 对
B. 错

MCS-51指令系统中,清零指令是CLR。( )

A. 对
B. 错

单片机应用系统中,一般采用软件方式去抖动。( )

A. 对
B. 错

1.如图所示电路中，当主程序正常执行时，P2所连接的8个LED将闪烁。若按INT0按钮开关，则进入中断状态，P2所连接的8个LED将变成单灯左移，而左移3圈后恢复中断前的状态，程序将继续执行8灯闪烁的功能。

2.如图所示，P0口接至阳极7段LED数码管。而P2.0连接PB1、PB2.1连接PB2，其中PB1具有增数的功能，PB2具有减数的功能。若程序刚开始时，7段LED数码管显示0，按一下PB1，则7段LED数码管显示1，再按一下PB1，则7段LED数码管显示2……；若7段LED数码管显示9，按一下PB1，则7段LED数码管显示9、再按一次PB2，则7段LED数码管显示8，再按一次显示7……，如此工作。

Most commonly, the term constitution refers to a set of rules and principles that define the nature and __________ of government.

A. extend
B. intent
C. extent
D. content

Most __________ seek to regulate the relationship between institutions of the state.

A. constitutions
B. institutions
C. institutes
D. constructions

in a basic sense, the relationship between the __________, but also the relationship of institutions within those branches.

A. President, Congress and the Justice
B. Government, legislature and the judiciary
C. executive, legislature and the Justice
D. executive, legislature and the judiciary