The term element refers to a pure substance with atoms all of a single kind. At present 107 chemical elements are known.
元素这一术语是指由单一种类的原子所组成的纯物质。现在已经知道有107种元素。 收藏。
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The term element refers to a pure substance with AToms all of a single kind. AT present 107 chemical elements are known.
元素这一术语是指由单一种类的原子所组成的纯物质。现在已经知道有107种元素。
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The opposite substrate 20 has substantially the same outline as the seal material 107. By this seal material 107, the opposite substrate 20 is fixed to the element substrate 10.