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【简答题】
合成叶绿素所必需的，缺植物在有光的条件下也不能合成叶绿素，而表现“”。请利用溶液培养法，根据所给的实验材料、用具验证铁的生理作用。 材料用具：长势相同的小麦幼苗若干，若干，完全培养液，只含铁的培养液，缺铁的“完全培养液”，蒸馏水，滴管，量筒。 根据实验目的结合表中所列具体内容，分析并回答相关问题： 请描述序号“2”所表示的主要实验内容。
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举一反三
【简答题】任何人不得以拒收、印售代币券等方式否认人民币在中国境内的法币地位，否则会依法受到行政处罚。()
【单选题】Directions: Choose the right one from the four choices marked A, B, C or D. Histologic samples were evaluated in a blinded _____ by one of the authors and an outside expert in rodent liver pa...
A.
basis
B.
method
C.
fashion
D.
approach
【简答题】The ( ) and ( ) for an accurate diagnosis of cirrhosis depend on the number and size of the histologic samples and on the sampling method.
【单选题】Histologic samples were evaluated in a blinded _____ by one of the authors and an outside expert in rodent liver pathology.
A.
basis
B.
method
C.
fashion
D.
approach
【单选题】The sampling theorem states that a signal of bandwidth W can be reconstructed from samples taken at the Nyquist rate of ______.
A.
W
B.
2W
C.
3W
D.
4W
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