某学生用如图a所示电路测金属导线的电阻率，可供使用的器材有：

被测金属导线ab，电阻约10Ω，导线允许流过的最大电流0.8A，稳恒电源E，电源输出电压恒为E=12V，电压表V，量程为3V，内阻约5KΩ，保护电阻：R₁=l0Ω，R₂=30Ω，R₃=200Ω．刻度尺、螺旋测微器，开关S，导线若干等

实验时的主要步骤如下：

①用刻度尺量出导线ab的长度l，用螺旋测微器测出导线的直径d．

②按如图a所示电路将实验所需器材用导线连接好．

③闭合开关S，移动接线触片P，测出aP长度x，读出电压表的示数U．

④描点作出U﹣x曲线求出金属导线的电阻率ρ．

完成下列填空：

按要求写句子。

雅鲁藏布大峡的发现是我国几代科学家辛勤努力的结果。（缩句）

根据短文内容判断句子正（T）误(F)。
Welcome to our school. Our school is on Xianyang Street. It’s next to the Xinhua Library. There is a big garden across from our school. The payphone is between our school and the post office. There are three buildings in our school, the students' building, the teachers'building and a library. The teachers in our school are good. Our school yard is very beautiful. If you come to our school from the airport, take a taxi and go along the highway until you see a bridge. Go across the bridge and turn left. Then go straight along the Bridge Street. Our school is on the right.