美国的领土扩驰是朝哪个方背的？
What was the directional flow of U. S. territorial expansion?
美国须要一个新的方背。
介绍了地线工程设计中常用的两类综开方式；谈论了地线方背性解数的盘算和驻波带阔盘算。
Introduced two synthesis approach which are commonly used in antenna design engineering, discussed the calculation of directional coefficient and the standing waves bandwidth.
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