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You should _______________ to one or more weekly magazines such as Time or Newsweek.

A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.

Tables______ of stones or wood.
80C51单片机定时器工作方式2是指的哪种工作方式________。
80C51单片机定时器工作方式1是指的哪种工作方式_______。
当需要从80C51单片机程序存储器取数据时,采用的指令为____.
80C51单片机的中断矢量地址是________.
80C51单片机并行I/O口P2的功能为______。
80C51单片机复位后,下列专用寄存器状态不为00H的是_______.
Without water, _________ no plants or animals.
_________ in a person’s speech or writing usually ranges on a continuum from casual or colloquial to formal or polite according to the type of communicative situation.
All people, whether they be rich or poor, strong or weak, privileged or deprived,are interdependent, and _______ the common task of seeking to achieve mankinds full potential
除了单片机芯片和电源外,AT89C51单片机最小系统包括(____)电路和(____)电路。
80C51单片机并行I/O口P0的功能为______
一、单项选择(每小 2 分,共 10 分)1 .80C51 单片机在同一优先级的中断源同时申请中断时,CPU 首先响应______。
单片机是将_____ 、______ 、I/O口集成到一块芯片上。
8051单片机的两种低功耗模式是 ______和 _______ 。
MCS-51单片机中断系统中有___;___;___;___;___。
89C51单片机片内RAM中位寻址区的地址范围是 ___,工作寄存器区的地址范围是___,片内程序存储器中寻址区的地址范围是___。
Duty is an act or a course of action that people __________you to take by social customs, law or religion.
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