In the step (2) or (3), it introduces silver, copper or zinc salt to the sol system.

在步骤(2)或步骤(3)中向溶胶体系引入银、铜或锌盐。

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WO_ (3) electrochromic films were prepared on ITO glass substrates by the sol-gel method.

采用溶胶-凝胶法，在氧化铟锡(ito)玻璃基质上制备氧化钨电致变色薄膜。

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