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下图为探究酸奶的制作条件的实验过程图，请据图回答： (1)实验中设置实验乙的目的是________。 (2)实验过程中需要清洗烧杯等实验器材，并进行加热处理。目的是__________。 (3)冷却后，加入酸奶并搅拌的目的是___________。 (4)该实验中，设置的变量是___________。你推测甲、试验中的玻璃瓶放在30℃的条件下放置4～6小时后最有可能制成酸奶的是__________。 (5)该实验是为了探究酸奶的制作需要在______________条件下。
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