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【单选题】
定时器1工作在计数，其外加的计数脉冲信号应连接到引脚。A.
P 3.2
B.
P 3.3
C.
P 3.4
D.
P 3.5
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皮皮学刷刷变学霸
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【简答题】定义a※b=a 2 ﹣b，则（1※2）※3=（ ）
【简答题】对实数a、b，定义“★”运算规则如下：a★ b= b(a≤b) a 2 - b 2 (a＞b) ，则 7 ★（ 2 ★ 3 ）=______．
【简答题】定义一种新运算a⊕b=2a-b，a?b=b-a，求（2⊕3）⊕（3?2）=______．
【单选题】Which of the following is an important input to scope verification?
A.
Work results
B.
Historical information
C.
Formal acceptance
D.
Change requests
【简答题】Visit one of the most outstanding prehistoric sites in the United Kingdom, and enjoy amazing historic English attractions. Please notice that every tour starts and ends in London. Have a tour with Vis...
【单选题】What is the talk mainly about?
A.
Overland transportation in the nineteenm century.
B.
Historical aspects of mail delivery.
C.
Vehicles currently in use by the postal service.
D.
The invention of the railroad.
【单选题】The city council spent a lot of budget to______ the old castle and other places of historic interest.
A.
reserve
B.
converse
C.
preserve
D.
conserve
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