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【单选题】
用 pH 试纸测定某无色溶液的 pH 时,规范的操作是 ( )A.
将 pH 试纸放入溶液中，观察其颜色变化，跟标准比色卡比较
B.
将溶液倒在 pH 试纸上跟标准比色卡比较
C.
用干燥的洁净玻璃棒蘸取溶液，滴在 pH 试纸上，跟标准比色卡比较
D.
在试管内放入少量溶液，煮沸，把 pH 试纸放在，观察颜色，跟标准比色卡比较
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