题目

将一个水平方向的弹簧振子从它的平衡位置向旁边拉开5cm，然后无初速释放，假如这振子振动的频率为5Hz，则振子在0.8s内通过的路程是________。 答案：0.8mI regret ________ that you have failed the exam, but what you should do now is not to regret ______ so much time but to seize every moment from now on.A．to inform; wastingB．informing; to waste C．to inform; to wasteD．informing; wasting