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【单选题】
凯达尔定氮法的关键步骤是消化，为加速分解过程，缩短消化时间，常加入适量的A.
无水碳酸钠
B.
无水碳酸钾
C.
无水硫酸钾
D.
草酸钾
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举一反三
【简答题】家庭美术教育有哪些方法？
【单选题】The house was very quiet, ____ as it was o n the other side of a mountain. being isolated isolated isolating having been isolated
A.
being isolated
B.
isolating
C.
isolated
D.
having been isolated
【简答题】__________。 [A] devoted [B] confused [C] sensible [D] isolated
【简答题】听力原文： The cigarette industry began in the 1870s with the development of the cigarette manufacturing machine. This made it possible to produce great numbers of cigarettes very quickly, and it reduced t...
【单选题】Bows and arrows have _______ been out of use.
A.
long after
B.
long before
C.
before long
D.
long since
【简答题】家庭美术教育有哪些方法?
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