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下列试管中加入碘液后变成蓝色的是( ) ①2ml淀粉溶液+2ml唾液,37℃,5min ②2ml淀粉溶液+2ml清水,37℃,5min ③2ml淀粉溶液+2ml稀释唾液,37℃,5min ④2ml淀粉...
题目内容:
下列试管中加入碘液后变成蓝色的是( )
①2ml淀粉溶液+2ml唾液,37℃,5min
②2ml淀粉溶液+2ml清水,37℃,5min
③2ml淀粉溶液+2ml稀释唾液,37℃,5min
④2ml淀粉溶液+2ml唾液,95℃,5min
⑤2ml淀粉溶液+2ral唾液+3滴盐酸,37℃,5min
A. ①②③ B. ②③④ C. ②④⑤ D. ③④⑤
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