什么是国家计量基准，它的主要作用是什么
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1\u3001\u8ba1\u91cf\u4e0e\u79d1\u5b66\u6280\u672f\u3000\u3000
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2\u3001\u8ba1\u91cf\u4e0e\u751f\u4ea7
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3\u3001\u8ba1\u91cf\u4e0e\u4eba\u6c11\u751f\u6d3b\u3000\u3000
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4\u3001\u8ba1\u91cf\u4e0e\u8d38\u6613
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5\u3001\u8ba1\u91cf\u4e0e\u56fd\u9632
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