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【简答题】
绘图工具有________、________、橡皮擦工具、油漆桶工具、渐变工具、仿制图章工具等。
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举一反三
【单选题】— I dropped in at your house at about ten last night, but you weren't in. — I ______ regular exercises at the club. [ ]
A.
did
B.
was doing
C.
had done
D.
have been doing
【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。 （ ）
【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.
have waited
C.
am waiting
D.
had waited
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