A.Women bargain for their clothes, but men do not. B.The fact that men do not try clothes on in a shop. C.The time they spend buying clothes. D.Women never take advice, but men do.
【简答题】A mass m is resting on a horizontal frictionless suce attached to a spring of spring force constant k . At time t= 0 , the mass is given a sharp blow, causing it to move the right with speed v . Th...