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垂直于一个投影面而与另外两个投影面平行的直线称为投影面平行线。
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下列关于物品的描述中,从经济学的角度,哪些是正确的?
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in fact exist combinationdifferentadmitreliable whilelostimaginarywhether considered howeverIs there something as truth? For a good many centuries “the search for truth” has been ( 1 ) the noblest activity of the human mind, but the seekers after truth have come to such ( 2 ) conclusions that it often seems that very little progress has been made. ( 3 ) there are many people who feel that we are actually going backward. They ( 4 ) often contemptuously, that we have accumulated more “knowledge” than our ancestors, but they think we are farther from the truth than ever, or even that we have ( 5 ) the truth that we once possessed.If people look for anything long enough without finding it, the question naturally arises ( 6 ) the thing is really there to find. You have seen a picture of an animal with a lion’s head, a goat’s body, and a serpent’s tail—and maybe an eagle’s wings for good measure. There is plenty of evidence that each part of this animal ( 7 ) —there is no ( 8 ) evidence that the parts ever occur in this ( 9 ) It is at least conceivable that the seekers after “truth” have made a similar mistake and invented an ( 10 ) combination.
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