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【单选题】
由555定时器构成的单稳态触发器,若电源电压为VCC =+6V,则当暂稳态结束时,定时电容C上的电压 uC 为 ( )。
A.
6V
B.
0V
C.
2V
D.
4V
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参考答案:
举一反三
【单选题】下列解析式中不是数列1,-1,1,-1,1…的通项公式的是 [     ]
A.
a n =(-1) n
B.
a n =(-1) n+1
C.
a n =(-1) n-1
【单选题】下列数列是等比数列的是(  )
A.
1,1,1,1,1
B.
0,0,0,…
C.
0, 1 2 , 1 4 , 1 8 ,…
D.
-1,-1,1,-1,…
【判断题】Most modern democratic states practice representative democracy.
A.
正确
B.
错误
【单选题】A) It had many problems. B) It was the most democratic country in the world. C) It was fair to women. D) It had some minor problems to solve.
A.
It had many problems.
B.
It was the most democratic country in the world.
C.
It was fair to women.
D.
It had some minor problems to solve.
【单选题】关于数列1,1,1,1,1,下列说法正确的是
A.
是常数列
B.
是递增数列
C.
是递减数列
D.
是摆动数列
【简答题】下列说法正确的是(  ) A.-1的相反数是1 B.-1的倒数是1 C.-1的平方根是1 D.-1的立方根是1
【判断题】判断下列数列是否为等比数列: (1)1,1,1,1,1;
A.
正确
B.
错误
【简答题】已知LED=0110 0011,计算LED1= ?LED2= ?
【单选题】The Democratic and Republican parties are the largest and most competitive organizations in the American community. Americans almost inevitably become Democrats or Republicans because there is usually...
A.
The election system.
B.
The parliamentary system of government.
C.
The large number of representatives.
D.
The different election districts.
【单选题】下列说法正确的是 [     ]
A.
-1的相反数是1
B.
-1的倒数是1
C.
-1的平方根是1
D.
-1的立方根是1
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