题目

When we go out traveling,we need either a map or GPS to point us in the right direction.But bumblebees（大黄蜂）have neither of these things,yet they still know the best route.Why is that?It turns out that these hard-working little bees try many possible passages before picking out the best one and remembering it the next time they journey out.They learn from“trial and error”,according to a study by scientists from the University of London.We use it all the time in our daily lives—trial and error is a helpful problem-solving method.It is the basic concept of“learning from your mis（1）用游标卡尺测出某圆柱体的直径为8.05 cm，则使用的是_____分度的游标卡尺（选填“10”、“20”或“50”）。（2）关于图示力学实验装置，下列说法中正确的是______。A．用此装置“研究匀变速直线运动”时不需要平衡摩擦力B．用此装置“探究小车的加速度与外力的关系”时，若用钩码的重力代替细线对小车的拉力，应保证钩码质量远小于小车质量C．用此装置“探究功与速度变化的关系”时，将长木板远离滑轮一端适当垫高，且小车未拴细线，轻推小车后，通过纸带分析若小车做匀速运动，即实现平衡摩擦力