下列有关说法中,正确的是(     ) A、加热试管中的液体时,试

下列有关说法中,正确的是(    

A、加热试管中的液体时,试管应垂直于酒精灯的火焰上方

B、将pH试纸直接伸进一瓶溶液中,测定溶液的pH

C、将试管夹从试管底部往上套,夹在试管

D、用镊子小心地将块状固体投入垂直放置的试管中

答案

C

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