For example , exchange rate risk could be removed by constraining movements in the exchange rate for the convertibility undertaking to an even narrower range , settlement risk could be removed by changing the settlement convention from t 2 to t 0 , and portfolio risk had already become less of an issue following the technical measures introduced in september 1998 . 7 例如,只要把兌換保證匯率的變動(dòng)限制在更窄的幅度內(nèi),便可消除匯率風(fēng)險(xiǎn)把結(jié)算慣例由t 2變?yōu)閠 0 ,便可消除結(jié)算風(fēng)險(xiǎn)至于投資組合風(fēng)險(xiǎn),繼1998年9月推出技術(shù)性措施后,亦已成為較次要問題。