The underlined word "this" in the second paragraph refers to

The underlined word "this" in the second paragraph refers to the change that____

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属水溶性固体分散体载体材料的是(  )

属水溶性固体分散体载体材料的是(  )

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借助于手动泵的压力将药液喷成雾状的制剂是(  )

借助于手动泵的压力将药液喷成雾状的制剂是(  )

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