公募证券是指发行人通过中介机构向特定的社会公众投资者公开发行的证券。( )
参考答案：错
David failed in the final examination last term and only then _____ how much time he had wasted before.[ ]
A. had he realized
B. he had realized
C. did he realize
D. he realized
关于物体做竖直上抛运动的下列说法正确的是
A．物体上升到最高点时速度和加速度都为零
B．物体上升和下落的时间不相等
C．落回抛出点时的速度跟物体在抛出时的初速度相同
D．物体做匀变速直线运动
