What was the result of Columbus' two trips to America?
A.They led to the discovery of America.
B.They made native American foods popular.
C.They brought great wealth to Spain.
D.They made native American life styles well-known.
第2题
第3题
A.总电势值
B.基尔霍夫
C.回路电流、欧姆
D.中间导体
E.以上都不是
第4题
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