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【单选题】
蒸馏样品时加入适量的磷酸,其目的是A.
使溶液的酸性增强
B.
使磷酸根与挥发酸结合
C.
使结合态的挥发酸游离出来,使于蒸出
D.
提高蒸馏温度
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举一反三
【单选题】Jack succeeding in ___ his father ___ buying him a new computer.
A.
letting...into
B.
asking...into
C.
telling...into
D.
talking...into
【单选题】Jack underwent three successive operations on the left leg in two weeks.
A.
happening now and then
B.
happening one after another
C.
successful
D.
succeeding
【单选题】Let us pursue this initiative step by step, and deliver _____one by one.
A.
its achievements
B.
it achievements
C.
their achievements
D.
theirs achievements
【单选题】Let us pursue this initiative _____, and deliver its achievements one by one.
A.
step after step
B.
step with step
C.
step in step
D.
step by step
【简答题】Too many of us just sit back and say "I'll let the experts deal with it."
【单选题】2018 年 3 月份国家发展与改革委员会公布的《必须招标的工程项目规定》中规定:施工单项合同估算价在( )万元人民币以上的项目必须进行招标。
A.
100
B.
200
C.
400
D.
300
【简答题】客家人为什么选择亦耕亦读,耕读传家的生产生活方式呢?
【简答题】Too many of us just sit back and say 'I'll let the experts deal with it.'
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