【名词&注释】
蒸馏水(distilled water)、金属钠(metallic sodium)、碱式滴定管(basic buret)、橡皮管(rubber pipe)、酸式滴定管
[单选题]下列有关实验操作的说法正确的是
A. 可用25ml碱式滴定管量取20.00ml KmnO4 溶液
B. 用pH试纸测定溶液的pH时，需先用蒸馏水润湿试纸
C. 蒸馏时蒸馏烧瓶中液体的体积不能超过容积的2/3，液体也不能蒸干
D. 将金属钠在研体中研成粉末，使钠与水反应的实验更安全
查看答案&解析
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举一反三：
[单选题]听第9段材料，回答第13-16题。第13题：
A. Who Could the man Speaker most probably be ?
B. a person who saw the accident
C. the driver of the lorry
D. a police officer
[单选题]Before Parbati studied in a boarding school,
A. she spent her time hunting with her father
B. she learned how to sing love songs
C. she had already been called an elephant princess
D. she was taught how to hunt tigers
[单选题]What does Henry like doing at airports? （ ）
A. Watching people．
B. Telling stories．
C. Reading magazines．
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