[练习册] 二元一次方程组-1

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• 右上角的时钟图标点击可以打开和关闭计时器
• 右上角的文件夹图标点击可以打开和关闭当前题号
• 题目右上角的星星图标点击可以收藏题目，所有被收藏
  的题目均可在“我的记录”-“收藏夹”中找到
• 点击右下角的Next图标可以进入下一题。注意：如果你
  没有做当前题目，你将不可以进入下一题
• 点击左下角的Quit或EndExam图标即可退出。注意：
  如果你选择退出考试，那么你的本次考试将不被记录