tup2 = (1, 2, 3, 4, 5, 6, 7 )print ("tup2[1:5]: ", tup2[1:5])
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tup1 = (12, 34.56)tup2 = ('abc', 'xyz')tup1[0] = 100 tup3 = tup1 + tup2print (tup3)
tup = ('Google', 'Runoob', 1997, 2000)del tupprint (tup)
names=('Joker','Joe','Jack')print(names[0])
运用叠加定理时,电压源不作用,应令其,同时保留其内阻。
A. 断路
B. 短路
C. 不变
D. 空载