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【单选题】
如图2-8所示,某输出变压器的副绕组有中间抽头,以便接8Ω或2Ω的扬声器,两者均能达到阻抗匹配,则副绕组两部分匝数比N2/N3为——A.
1
B.
2
C.
3
D.
4
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A.
After all
B.
In all
C.
First of all
D.
Above all
【单选题】____________ bag is yellow.__________ bag is red.
A.
M y;Her
B.
I;She
C.
M y;She
D.
I;Her
【单选题】—Is _______ red bag under the table yours, Jean? —No, I only have _______ yellow bag. Maybe it’s Julia’s.
A.
a; the
B.
the; a
C.
a; a
D.
the; the
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【单选题】A bag contains 6red marbles, 5yellow marbles, and 7green marbles. How many additional red marblesmust be added to the 18marbles already in the bag sothat the probability of randomly drawing a red marb...
A.
12
B.
16
C.
18
D.
24
E.
36
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