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【简答题】
某国1990年的进出口总额为1000亿美元，2002年进出口总额为2000亿美元。以1990年为基期，2002年的进出口价格指数为120，试计算2002年的对外贸易量，并对2002年和1990年的对外贸易额和对外贸易量分别进行比较。
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