It includes head restrain post-displacement, static strength characteristic and dynamic characteristic.
分析内容分包括座椅头枕的后移量，头枕的静强度以及头枕的吸能特性。
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The Obama years have turned much about U.S. politics on its head, such as the fact that Presidents usually restrain Congress on spending.
WSJ: Review & Outlook: The President's Priorities
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