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    【题目】在“探究小车的速度随时间变化的规律”的实验中，某同学操作过程中有以下实验步骤：

    A．拉住纸带，将小车移至靠近打点计时器处，先放开纸带，再接通电源；

    B．将打点计时器固定在长木板上，并连接好电路；

    C．把一条细绳拴在小车上，细绳跨过定滑轮，下边吊着适当重的钩码，放手后看小车能否在木板上做平稳的加速运动；

    D．断开电源，取下纸带；

    E．把一端附有定滑轮的长木板平放在实验桌上，并使附有定滑轮的一端伸出桌面；

    F．将纸带固定在小车尾部，并穿过打点计时器的限位孔；

    G．换上新纸带，重复操作两次。

    （1）其中有错误的步骤是____________；应改正为____________________。

    （2）将改正后的步骤按合理的顺序写在横线上：

    步骤顺序为______________。

    【答案】（1）A 应先接通电源，再放开纸带 （2）EBCFADG

    【解析】（1）打点计时器在使用时，为了使打点稳定，同时为了提高纸带的利用率，使尽量多的点打在纸带上，要应先接通电源，再放开纸带，故A错误。

    （2）本着先安装器材，后进行实验的思路，如在该实验中，先固定长木板，安装打点计时器，准备完毕开始进行实验，注意要先打点后释放小车，做完一次实验要及时关闭电源，故正确的实验步骤是EBCFADG。

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