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【简答题】
(1)已知图(a)所示电容电压u的波形如图(b)所示，试求i(t)并绘出波形； (2)若已知的是电流i的波形，如图(c)所示，且u(0)=0，试求u(t)，t≥0，并绘出其波形。如果u(0)改为-20V，结果又如
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【单选题】In order to earn more money for his new car, the young man has to work for three ______ hours in the evening. [ ]
A.
extra
B.
many
C.
else
D.
another
【单选题】_____ earn more money for his new car, the young man has to work for three _____ hours in the evening. [ ]
A.
In order to, extra
B.
In order that, many
C.
In order that, else
D.
In order to, another
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A.
three fourths; has
B.
three fourths; have
C.
three fourth; has
D.
three fourth; have
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【简答题】水果和蜂蜜所含的葡萄糖和果糖属于()。
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