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【单选题】
欲使N沟道增强型场效应管具有导电沟道，应使（ ）。A.
U GS ＞ U GS , off
B.
U GS ＞ U GS , th
C.
U GS ＜ U GS , off
D.
U GS ＜ U GS , th
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举一反三
【单选题】Using the technique of electrophoresis to study sickle cell anemia, Pauling concluded that ( ).
A.
polypeptides carry the genetic information
B.
the sickle cell gene chemically alters the hemoglobin protein
C.
DNA carries the genetic information
D.
the one-gene-one-enzyme hypothesis was incorrect
【单选题】Which type of mutation leads to sickle cell anemia? Choose the one best answer.
A.
Silent
B.
Nonsense
C.
Insertion
D.
Deletion
E.
Missense
【单选题】U s ing the technique of electrophoresis to study sickle cell anemia, Pauling concluded that ( ).
A.
polypeptides carry the genetic information
B.
the sickle cell gene chemically alters the hemoglobin protein
C.
DNA carries the genetic information
D.
the one-gene-one-enzyme hypothesis was in c orrect
E.
none of the above
【简答题】镰状细胞贫血( sickle cell anemia) :
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