题目

In Thailand and other partsof South-East Asia, the normal greeting is to bow(轻微)with the hands pressedtogether. 答案：【1】slightly15．如图所示，正方体a重10N；正方体b重18N，边长为10cm，不计绳重和摩擦，则b对地面的压力为8N，b对地面的压强为800Pa．