皮皮学，免费搜题
登录
搜题
【简答题】
根据图中实验回答问题 (1) 如图 1 所示,在热水和冷水中分别滴入两滴墨水,不要搅动杯中的水,热水杯中的墨水扩散得快,选用热水和冷水做实验的目的是便于探究分子无规则运动速度与 的关系 . (2) 如图 2 所示,瓶内装有少量的水,水上方有水蒸气,塞紧瓶塞,用打气筒向瓶内打气,当塞跳起时,有白雾产生,白雾是水蒸气 而成的,这说明气体对外做功时,内能 ,温度 . (3)如图3所示是热机的这个冲程是通过 的方式改变它的内能. (4)如图4所示,在试管中装些水,用软木塞塞住,用酒精灯给水加热至沸腾的过程中,这是用 的方法使水的内能增加,发生的能量转化是 ;当软木塞被冲出时,发生的能量转化是 这个实验虽然简单,却表现出热机中能量转化的基本过程。
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】University students must ______ themselves; otherwise, they will never complete their studies and get a bachelor's degree within four years.
A.
be saddled with
B.
be deceived into
C.
be based on
D.
be strict with
【简答题】A.Two years． B.Four years． C.Three years． D.Two to four years．
【简答题】A．Twenty years. B．Four years. C．Twelve years. D．Twenty-four years.
【简答题】University students must __________themselves; otherwise, they will never complete their studies and get a bachelor's degree within four years.
【简答题】University students must be strict _______ themselves; otherwise, they will never complete their studies and get a bachelor's degree within four years.
【单选题】My brother has a ______ daughter. She’s kind and lovely.
A.
four-years-old
B.
four-year-old
C.
fourth-year-old
D.
four-year-olds
相关题目：
参考解析：
知识点：
题目纠错 0
发布
