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温室效应会导致全球升温,温室气体中最主要的成分是______,太阳出来了,草叶上晶莹的露珠不见了,这是______现象(填物态变化的名称),在此过程中,需要______(选填“吸热”或“放热”);将一瓶冰冻的矿泉水放在桌上,一会儿瓶壁会出现许多小水珠,这是______现象(填物态变化的名称).在瓶内冰块逐渐熔化的过程中,瓶内水的温度______(填“升高”、“降低”或“不变”),冬天,在炉子上烧菜的时候,火焰熄灭前、后瞬间会出现如图甲和乙所示的两种情景,可以确定______(甲/乙)是火焰熄灭前的情景.
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