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通常而言，对于证券组合的管理者而言，如果市场是强式有效的，管理者会选择消极保守的态度，如模拟某一种主要的市场指数进行投资。( )
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The rocket engine, with its steady roar like that of a waterfall or a thunderstorm, is an impressive symbol of the new space age. Rocket engines have (76) powerful enough to shoot astronauts (77) the earth’s gravitational pull and (78) them on the moon. We have now become (79) in space. Impressive and complex (80) it may appear, the rocket, which was (81) in China over 800 years (82) , is a relatively simple device. Fuel that is (83) in the rocket engine changes (84) gas. The hot and rapidly (85) gas must escape, but it can do so only through an opening that faces backward. As the gas is radiated with great force, it pushes the rocket in the opposite direction.
The rocket engine, with its steady roar like that of a waterfall or a thunderstorm, is an impressive symbol of the new space age. Rocket engines have (76) powerful enough to shoot astronauts (77) the earth’s gravitational pull and (78) them on the moon. We have now become (79) in space. Impressive and complex (80) it may appear, the rocket, which was (81) in China over 800 years (82) , is a relatively simple device. Fuel that is (83) in the rocket engine changes (84) gas. The hot and rapidly (85) gas must escape, but it can do so only through an opening that faces backward. As the gas is radiated with great force, it pushes the rocket in the opposite direction.
发热3～4天出疹的是
甲状腺危象原因为
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