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【单选题】
What would happen if one phase of business, such as transportation, were to suspend operations?A.
Factories wouldn’t be able to send their products by ships.
B.
Factories wouldn’t be able to manufacture their products.
C.
Factories wouldn’t be able to transport their products.
D.
Factories wouldn’t be able to sell their
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【单选题】5 Mark suggests that they _____.
A.
eat their picnic while travelling along the river
B.
move over to the bank and stop for a while
C.
eat their picnic in about ten minutes
D.
move over to the bank and eat their picnic
【简答题】Marksuggests that they _____.A. (a) eat their picnic while travelling along the river B. (b) move over to the bank and stop for a while C. (c) eat their picnic in about ten minutes D. (d) move over to...
【单选题】Mark suggests that he punt for _____.
A.
half an hour
B.
the first 20 minutes
C.
the first hour
D.
most of the trip
【简答题】51系列单片机具有几个中断源?其中哪些中断源可以被定义为高优先级中断,如何定义?
【单选题】设信号的波特率为500Baud,采用复合调制技术,由4种幅度和8种相伴组成16种码元,则食道的数据率为:
A.
500 bps
B.
1000 bps
C.
2000 bps
D.
4800 bps
【简答题】51系列单片机具有几个中断源,分别哪几个?其中哪些中断源可以被定义为高优先级中断,如何定义?
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