选择题：②该同学在开关断开情况下,检查电路连接无误后,将R2的阻值调至最大。后续的实验操作步骤依次是____

题目内容：

②该同学在开关断开情况下，检查电路连接无误后，将Ｒ２的阻值调至最大。后续的实验操作步骤依次是______________，______________，______________，______________，最后记录Ｒ1的阻值并整理好器材。（请按合理的实验顺序，选填下列步骤前的字母）

Ａ．闭合Ｓ１

Ｂ．闭合Ｓ２

Ｃ．调节Ｒ２的阻值，使电流计指针偏转到满刻度

Ｄ．调节Ｒ２的阻值，使电流计指针偏转到满刻度的一半

Ｅ．调节Ｒ１的阻值，使电流计指针偏转到满刻度的一半

Ｆ．调节Ｒ１的阻值，使电流计指针偏转到满刻度

参考答案：

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