【单选题】【消耗次数：1】
进行采矿模型试验时，下面那种做法是正确的
①
A、按照老师指示操作模型控制系统
②
B、随意移动模型位置方便观摩和行走
③
C、看到模型上的矿车、采煤机、液压支架小模型，自己感兴趣带回宿舍研究学习
④
D、在模型上留字-表示自己来过
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