二次标准燃料 secondary standard fuel
二次标准加入-逼近法 double standard addition-approaching
二次铁氧体标准 Secondary Ferrite Number Standard
二次型标准化 quadratic form standardization
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本文研究了二次标准加入法原理，证明了四个引理和两个定理。
The principle of a double standard addition method is strictly demonstrated. Four lemmas and two theorems are given and proved.
如果第一次标准化后的URL与第二次标准化后的URL不同，URLScan将拒绝该请求。
If the URL after the first normalization is different from the URL after the second normalization, URLScan rejects the request.
这是标准普尔一周内第二次降低葡萄牙的信用评级，究其原因，里斯本方面需要其他欧元单一货币区国家援助的可能性正在逐渐加大。
The reason for this, S&P's second downgrade of Portugal in less than a week, is that the likelihood is rising that Lisbon will have to be bailed out by the rest of the single-currency club.
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