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standard tape;reference tape
Molecular formula :

nature : one with stipulated characteristics, and other tape used for comparison selected as the base of comparison did not tape recorded. Benchmark belt with the main benchmark, with the second benchmark, with benchmarks such distinction. The main benchmark belt known as the first benchmark to bring it by the International Electrotechnical Commission (IEC), the designated national production and distribution. The second benchmark is the first to bring a copy with the benchmark, which has given the correction factor, character is very close to first base with downward for the money transfer is the second major benchmark belt. To ensure the accuracy of money, not first base with regular use. The daily testing should be used by the benchmarks with the second copy with the benchmarks. Belt also said the benchmark standard band (standard tape), but under certain conditions "with the standard" is the first benchmark belt.

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More Detailed Data:
1) standard
2) signal amplitude standard tape
3) magnetic tape;tape
Notice Some description was translated by software and the data is only as a reference.
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