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取一把铁锹(或一快干净铁片)放在火炉上烧红,然后把需要鉴别的化肥抓一把放在上面,就能鉴别:冒烟后化成水的是尿素,冒烟且发
Take a shovel (or a quick clean iron) on the stove to burn red, and then identify the need to identify a fertilizer on it, you can identify: smoke into the water after the urea, smoke and hair