试题 :下图是测量种子萌发时锥形瓶中气体体积变化的实验装置。锥形瓶中放的种子事先用水浸泡过并在稀释的消毒剂中清洗过 (不影响种子生命力 )。实验开始时管Ｙ与管Ｘ液面相平 ,每隔半小时利用标尺量出Ｘ管内的液面高度变化 ,实验结果记录于下表。回答下列问题 :时间 (小时 )? Question: The following figure is an experimental setup for measuring the change in gas volume in Erlenmeyer flasks when the seeds germinate. The seeds in the conical flask were soaked in water beforehand and washed in a diluted disinfectant (without affecting the vitality of the seeds). At the beginning of the experiment, the tube Y was level with the tube X. The height of the liquid in the tube X was measured with a ruler every half hour. The experimental results are recorded in the following table. Answer the following questions: Time (hours)?