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【简答题】
1 电路概述 电路中,若 A 点电位 V A =20V , B 点电位 V B = - 6V ,则电压 U AB = V 。
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【单选题】—You were out when I dropped in at your house. —Oh, I ________ for a friend from England at the airport.
A.
was waiting
B.
had waited
C.
am waiting
D.
has waited
【单选题】—You were out when I dropped in at your house yesterday. —Oh, I________ for a friend from Beijing at the railway station.
A.
was waiting
B.
had waited
C.
am waiting
D.
have waited
【简答题】如图7.4.7所示电路，已知R=0.5Ω，L=1H，C=1F，a=0.25，求：
【简答题】纳税担保的形式包括保证、抵押、质押。 （ ）
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