完全竞争市场与完全竞争厂商的需求曲线都是向右下方倾斜的。
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当CPU响应外部中断0的中断请求后,程序计数器PC的内容时_______。
A. 0x0003
B. 0x000B
C. 0x0013
D. 0x001B
串行口时单片机的_______。
A. 内部资源
B. 外部资源
C. 输入设备
D. 输出设备
当采用定时器T1作为串行口波特率发生器使用时,通常定时器工作方式_______。
A. 0
B. 1
C. 2
D. 3
Complete the sentences with the words and phrases.1.One of the cultural differences that tends to annoyAmericans ①________ understanding of punctuality.2.②__________at work starts with getting to work on time!3.While not all Americans are punctual all the time, the society③__________ operates ④__________well-kept schedules.4.Their ⑤___________ was “Ah! You're here! We can start now!”5.They would have left me a message asking to ⑥__________the meeting.6.They are sure to help you ⑦_______ your American colleagues.7.Don't just ⑧_______ and expect people to ⑨_______ to talk with you.