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以下不属于常量元素的组合是A、镁、钾、钠B、钙、氯、硫C、磷.....
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In the sentence "He told me that his brother John is a world-famous doctor", the italicize..
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从工艺上采取各种措施,使铸件上各部分之间没有温差或温差很.....
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大量饮清水后,尿量增多主要是由于A、肾小球毛细血管血压升高.....
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Both approaches agree on what is depicted in the poem, but not on how it should be ______...
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以下是室内甲醛的主要来源,除了A、建材B、合成化纤制品C、家.....
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