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Network hardware
Related to any equipment that facilitates the use of a computer network.
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鈣
Chemistry; General chemistry
化學元素符號 Ca 和原子數 20。它有 40 的原子品質的 。078 amu。鈣是一種軟灰色的鹼土金屬，和是大眾在地殼中的第五最豐富的元素。
