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【简答题】
在霍尔法测磁场实验中,使用的霍尔元件是N型半导体。如果保持工作电流、励磁电流不变,改用几何尺寸和载流子密度均相同的P型半导体,实验过程会有什么变化,试分析。
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举一反三
【单选题】In the sentence "Not every winter is critical for deer course", the word "critical "means
A.
finding fault.
B.
forming a crisis
C.
urgently needed
D.
important
【单选题】In the sentence "Not every winter is critical for deer of course", the word" means_______
A.
finding fault
B.
forming a crisis
C.
urgently needed
D.
important
【单选题】In the sentence "God would not suffer Mr. Cotton err", the word "suffer" probably means .
A.
force
B.
let or allow
C.
see
D.
hear
【单选题】In the sentence "Not every winter is critical for deer of course", the word "critical" means .
A.
finding fault
B.
forming a crisis
C.
urgently needed
D.
important
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