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发行国际债券的信用级别评定必须由( )进行。
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2009年3月18日，沪深300指数开盘报价为2335.42点，9月份仿真期货合约开盘价为2648点，若期货投机者预期当日期货报价将上涨，开盘即多头开仓，并在当日最高价2748.6点进行平仓，若期货公司要求的初始保证金等于交易所规定的最低交易保证金10%，则日收益率为( )。
Passage ThreeWe spend our leisure hours efficiently for higher production, live by the clock even when time does not matter, modernize our homes and speed the machinery of living in order that we can go to the most places and do the most things in the shortest period of time possible. We try to eat, sleep, and talk efficiently. Even on holidays and Sundays, the efficient man relaxes on timetable with one eye on the clock and the other on an appointment sheet.To squeeze the most out of each shining hour we have shortened the opera, quickened the pace of the movie and put culture in pocket-sized packages. We make the busy bee look like a lazy creature, the ant like a sluggard. We live sixty-mile-minute and the great efficiency smiles.We wish we could return to that pleasant day when we considered time a friend instead of an enemy; when we did things willingly and because we wanted to, rather than because our timetable called for it, But that of course would not be efficiency; and we Americans must be efficient. The word "sluggard" means （）
( )，我国停止发行国债。
下列属于房屋的基本组成部分的是( )。
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