题目

Colour songLet's play a little gamesee if you get it rightTell me what colour I'm talking aboutLet's play a little gamesee if you get it right Tell me what colour I'm talking about What's the colour that thymes with shoe?What's the colour that rhymes with glue?Blue, blue, blue.What's the colour that rhymes with bed?What's the colour that rhymes with head?________________________________Let's play a little gamesee if you get it rightTell me what colour I'm talking about Let's play a little gamesee if you get it right Tell me what colour I'm talking aboutWhat's the colour that rhymes with bean?W如下图所示，重2250N的门形钢架与地面的接触面积为2000cm2，重500N的物体底面积为0.25m2.人未施力时，物体对地面的压强为         Pa；当物体被匀速提起10cm时，人手所做的功为          J（不计绳重，滑轮重和摩擦）