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【单选题】
物质结构研究的是：我们现实生活的物质世界，是如何由各自独特的微观粒子在不同层次上构成的；千差万别的物质性质是如何由它的微观结构所决定的。近代物质结构理论已经经历了三次大突破。从18世纪后半期开始，人们逐渐弄清了不同的物质是由不同的分子组成的，分子由原子组成，原子由围绕着它作高速旋转的核外电子和原子核组成。原子核虽然只有原子体积的十万亿分之一，但这种小小的原子核又是由中子、质子组成。在20世纪60年代，高能物理实验又发现了许多与质子、中子有强相互作用的新粒子，这些新粒子以及中子、质子、介子等统称。高能物理实验表明，也有结构，理论物理认为夸克是构成的下一层次粒子。理论物理学家把在夸克间传递强相互作用的粒子称为胶子。果然不出所料，这种胶子1979年被美籍华人、著名物理学家发现，又一次证明了理论物理的正确。1979年基于基础理论，美国物理学家格拉肖·温伯格和巴基斯坦物理学家萨拉姆做出弱电中的三个中间玻色子w-、w+、z0的预言，从而荣获物理奖。1983年上半年在日内瓦的质子——反质子对撞机上找到了它们，实验值与理论预期值也高度符合。目前，物质结构理论正面临第四次突破。 开头部分加点的“它”所指代的是哪一项：
A.
各自独特的微观粒子
B.
千差万别的物质
C.
千差万别的物质性质
D.
微观粒子和物质性质
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B.
meet her first goal since sole proprietorships are easy and inexpensive to form. However, she would expose herself to personal risk because owners of sole proprietorships have unlimited liability.
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查看完整题目与答案
【单选题】A U.S. firm sells merchandise today to a British company for £100,000. The current exchange rate is $2.03/£, the account is payable in three months, and the firm chooses to avoid any hedging technique...
A.
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【单选题】耻骨联合上缘至股骨内上髁上缘的骨度分寸是
A.
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B.
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查看完整题目与答案
【单选题】耻骨联合上缘至股骨内上髁上缘的骨度分寸是
A.
14寸
B.
15寸
C.
18寸
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