这些目标在研发中往往相互牵制，例如减重可能影响结构强度，减小体积会加重发热，引入特种材料以改善性能往往会增加成本。因此，企业需要在理想设计与现实条件间做出权衡。
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，详情可参考WPS官方版本下载
But as the proceedings dragged on, Musk admitted he was trying to avoid giving "yes" or "no" answers, accusing Arnzen of "trying to mislead the jury" with his questions.
Middle East war now involves 17 different countries
，这一点在PDF资料中也有详细论述
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Фото: Алексей Сухоруков / РИА Новости。业内人士推荐下载安装汽水音乐作为进阶阅读