The peak time tp corresponds to one-half cycle of the frequency of damped oscillation.
A.
正确
B.
错误
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【简答题】已知圆 O 1 : x 2 +6x+ y 2 -1=0 ,圆 O 2 : x 2 -6x+ y 2 -5=0 ,点P满足 k P O 1 ? k P O 2 =2 (1)求动点P的轨迹方程; (2)过点Q(1,2)能否做直线AB与P的轨迹交于A、B两点,并且使Q是AB的中点?如果存在,求出直线AB的方程;若不存在,请说明理由.