一演员携带两个演出用的铁球欲经过一座小木桥,但人和铁球的总重量略大于桥的最大负荷量,为了能一次安全过桥,演员像演出一样将两球抛起,并保证任何时刻最多只有一个铁球在手中。这样一边抛球一边过河,如图所示。问他这样能否安全过桥 An actor carries two iron balls for the show to go through a small wooden bridge, but the total weight of the person and the iron ball is slightly greater than the maximum load of the bridge. In order to make a safe crossing, the actor throws up two balls like a performance, and Guarantee that there is at most one iron ball in hand at any moment. This throws the ball while crossing the river as shown. Ask him if he can safely cross the bridge