【单选题】听力原文:M: Do you know what happened to me today? I was so embarrassed. W: What? M: Well, Dr. Brown's class finished ten minutes early, so I went to the library between classes. I knew I didn't have much...
A.
One of his classes finished early.
B.
His books were ten days overdue.
C.
He wanted to get some studying done.
D.
The library had a special display on the Industrial Revolution.
【单选题】岩石矿物在自然因素的作用下发生的化学变化称
【单选题】80C51单片机的 /EA引脚接 +5V时,程序计数器 PC的有效地址范围在 ______。
【单选题】已知某企业本月营业收入为 400 000元,营业成本200 000元,其他有关帐户月末结帐前的余额资料如下:管理费用5 000元,财务费用400元,营业外支出为40 000元,营业外收入为30 000元,该企业本月实现的营业利润为( )元。
【单选题】80C51单片机的/EA引脚接+5V时,程序计数器PC的有效地址范围在 ______ 。
【单选题】在自然因素的作用下岩石矿物发生的物理和化学的变化称为()
【单选题】80C 51 单片机的EA引脚接+5V时,程序计数器PC的有效地址范围是______。