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【单选题】
51单片机有多少个中断源?A.
5
B.
4
C.
6
D.
3
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反馈参考答案：
举一反三
【简答题】操作系统的基本特性是( )、( )、( )、( )。
【简答题】When the pressure gets low, the boilling-point becomes low.
【简答题】操作系统的基本特性是
【简答题】Changes in the prices of goods can cause changes in production and consumption. Production increases when the prices are high. As the prices of goods go up, producers make more goods because they can ...
【简答题】操作系统的基本特性是 、 、 、和 。
【单选题】When the costs of supplies increase in an industry, the low-cost leader
A.
may continue competing with rivals on the basis of product features.
B.
will lose customers as a result of price increases.
C.
will be unable to absorb higher costs because cost-leaders operate on very narrow profit margins.
D.
may be the only firm able to pay the higher prices and continue to earn average or above- average returns.
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