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1.取约9[厘米]~2大小的玻璃片一块,在 玻璃片上铺展一薄层脱脂棉(见附图)。 2.用1M食盐溶液浸透脱脂棉,使棉层贴于玻璃片上。用清洁的玻璃棒轻轻地从棉层上轧过,使棉层舒展平坦和含有适量的食盐溶液。
1. Take a piece of glass about 9 [cm]~2 in size and spread a thin layer of absorbent cotton on the glass piece (see photo). 2. Soak the absorbent cotton with 1M salt solution and apply the cotton layer to the glass sheet. Gently roll over the cotton layer with a clean glass rod, so that the cotton layer stretches flat and contains an appropriate amount of salt solution.