I have a good teacher. She is a tall woman with black hair. She is a little fat. She has two big eyes and a small nose. She likes smiling. She is very kind and patient to us. And at the same time, she is strict in class. After class, she lik
材料一:塔里木河位于新疆南部,是我国最大的内流河。塔里木河上游段常年有水,不仅水量大,而且水质好,补给量大于排泄量。中游段跑水缺口多,洪水期注入沙丘洼地的积水,几乎全部耗散于蒸发,直接转化为地下水的甚少。下游段因地表水急剧减少,补给更少,所以地下水出现区域性持续下降的趋势。
材料二:下图为塔里木河流域水系示意图。
如图是做电磁铁实验时连接的电路,将滑片P向左移动时,小灯泡中的电流将 ____,电压表的示数将 ____;电磁铁的磁性将 ____.(均选填“变大”、“变小”或“不变”)