一人站在楼上水平抛出一个小球，球离手的速度为v₀，落地时的速度为v_t，不计空气阻力.在下图所示的速度矢量变化情况的示意图中正确的一个是（   ）

Which firefighting method is an example of an indirect attack on a fire?（）.

A.Bouncing a straight stream of water off the overhead to create spray effect

B.Spraying foam on a bulkhead and letting it flow down and over a pool of burning oil

C.Flooding a paint locker with CO₂ and sealing the compartment

D.Cooling adjacent bulkheads with water to prevent the spread of the fire by conduction