【单选题】一简谐振动曲线如图所示.则振动周期是
A. 2.62 s． B. 2.40 s． C. 2.20 s． D. 2.00 s．
A. 2.62 s． B. 2.40 s． C. 2.20 s． D. 2.00 s．
举一反三
- 一简谐振动曲线如图所示。则振动周期是[img=331x188]1786a04966f0bc9.png[/img] A: 2.62 s B: 2.40 s C: 2.20 s D: 2.00 s
- 以下程序的执行结果是 #include < lostream >#include < stack >using nanespace std;void main( ){ stack< int> s; s. push(1); s. push(2); s. push(3); s. push(4); cout << "s.size:" < s.size() << ",s:"; while (!s. eapty()) { cout<s.top()<”; s. pop(); cout < endl;} A: s. size; 3, s: 123 B: s. size: 3, s: 432 C: s. size: 4, s; 1234 D: s. size: 4, s: 4321
- What were the millionaires average scores in college A: A’s and B’s. B: B’s and C’s. C: C’s and D’s. D: Not mentioned.
- What day was it yesterday A: It’s Sam’s. B: It’s Mike’s. C: It’s mine.
- 物体做简谐振动的振动方程为x=12cos(πt+0.5π)，则简谐振动的周期T= s.