按系数课征的关税

coefficient of association duties memorandum of association validity of association rights of association statute of association index of association association of classification society association an association of fellow provincials or townsmen Association for the Promotion of International Trade s coefficient of association coefficient of association association coefficient resumption of one's duties duties of the office imposition of duties fundamental duties of citizens ambiguity of power and duties be negligent of one's duties neglect of one's official duties rights and duties of relatives duties