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后浦卷2384在化学变化发生的同时,通常伴随着产生气体这一现象,可是那个实验能说明呢?老师给我们做的是锌粒和稀盐酸反映,能证明产生大量无色气泡,物体逐... -
冀段帝15677634439 ______[答案] 这是你们刚学化学是老师说的,你暂且可以接受,等到高中,你会学到很多没有气体产生的化学反应,对于这个实验,你的老师说的是对的,那个无色气泡就是产生的氢气.

后浦卷23841、开始给水加热时,在烧杯的器壁出现了许多小气泡,随着水的温度升高你观察到气泡:.你解释以上现象的原因是:2、当水沸腾时,你观察到气泡:你解... -
冀段帝15677634439 ______[答案] 1.气泡慢慢消失了 reason:温度升高,气泡在水中的溶解度降低. 2.杯壁上不断产生气泡并上升 reason:水不断转化为水蒸气,水蒸气密度低往上升. 希望对你有所帮助.

后浦卷2384 如图所示,在光滑的水平冰面上一个小孩坐在冰车上,冰车旁放着一个箱子 P ,开始时冰车和箱子都处于静止.已知冰车和小孩的总质量是箱子质量的10倍... -
冀段帝15677634439 ______[答案] 答案: 解析: 解 小孩每次推箱子的过程,系统的总动量都守恒,因此小孩和冰车的速度都将增大,一旦小孩(及冰车)的速率等于或大于推出去的箱子的速率,小孩就再也不会接到箱子. 设第一次推出箱子后,冰车的速度为v1 则 0.1m·v=m·v1...

后浦卷2384 小红买了一支温度计,回家后发现里面有一个小气泡,先拿它在冰箱里试一下,在标准温度是零下7℃时,显示为 - 11℃,在36℃的温水中,显示为32℃,那... -
冀段帝15677634439 ______[答案] 根据题意得到标准温度与温度计量得的温度是一次函数关系, 设标准温度为y,温度计量得的温度为x,则y=kx+b, 当x=-11,y=-7;当x=32,y=36, ∴-11k+b=-7,32k+b=36,解得k=1,b=-4, ∴y=x-4, 当x=22时,y=22-4=18. 故答案为18℃.

后浦卷2384上海桃浦路附近哪里有卖泡沫保鲜箱的?
冀段帝15677634439 ______ 墨河路应该有批发的

后浦卷2384保温的那种泡沫箱哪里有得卖?? -
冀段帝15677634439 ______ 家庭用的泡沫箱不多见,一般物流、水果、海鲜用的比较多,去水果店或者附近超市去看看,说不定别人会送给你呢

后浦卷2384哪里有卖泡沫箱? -
冀段帝15677634439 ______ 哪里有卖泡沫箱呢?我的尺寸比较小,15*12左右的.海鲜批发市场吗?补充:我打算成批购买满意答案憩簟锝*恺莳3级2010-04-07恩!的确海鲜市场有很多,你可以去跟海鲜打包商,商量买一个啊! 补充: 我也不知道怎么跟你说!我们这边有...