题目内容

A.neverB.everC.sometimesD.often

A. never
B. ever
C. sometimes
D. often

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在氧化还原滴定中,选择指示剂的基本原则是______。

A.questionB.notionC.exceptionD.vocation

A. question
B. notion
C. exception
D. vocation

我国西北地区物资出口最为便捷的港口是()

A. 连云港
B. 青岛
C. 天津
D. 秦皇岛

A.to ask forB.asking forC.to ask aboutD.asking about

A. to ask for
B. asking for
C. to ask about
D. asking about

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