滚动投资
滚动投资-
区探、预探、评价、滚动投资比例；
The proportion of regional , preliminary , appraisal and progressive exploration investment ;
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在所有截至2002、2003和2004年的五年周期内，五年滚动周期年均投资回报率最低值应该是3%。
The lowest average annual return on a five-year rolling basis would have been 3 per cent , between any of the five-year periods ending 2002 , 2003 and 2004 .