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【单选题】
肥料、土壤以及某些有机化合物常常需要测定其中氮的含量，通常是将样品先经过适当的处理，将其中的各种含氮化合物全部转化为氨态氮，然后进行测定。常用的方法有。 （ ）A.
A蒸馏法
B.
B甲醛法
C.
C返滴定法
D.
D置换滴定法
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【单选题】By saying that the book of 'Grail Bird' could 'easily be a book about the hunt for Bigfoot', the author means that______
A.
the book is merely about the hunt for impossible things.
B.
if the bird had not been discovered by the researchers, the book would have been like all the books about Bigfoot - only legends, no facts and truths.
C.
the hunt for the ivory-billed woodpecker enjoys similarity to the hunt for Bigfoot, because both of them are rare animals.
D.
the book is about the human obsession of finding legendary animals and about their guilty conscience facing nature.
【简答题】使用MMC有两种常规模式,分别是 和作者模式。
【简答题】使用MMC有两种常规模式,分别是_____和_____。
【单选题】关于曲线运动,下列说法中正确的是( )
A.
曲线运动物体的速度方向保持不变
B.
曲线运动一定是变速运动
C.
物体受到变力作用时就做曲线运动
D.
曲线运动的物体受到的合外力可以为零
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