欧洲宇航防务集团北美区首席执行官肖恩·奥基夫说，“去年十一月中旬发布项目建议要求书询价时，就声称授予合同是其中一部分。”
EADS of North America CEO Sean o 'keefe said, "the contract award, which was announced as part of the request-for-proposal solicitation, was to have been around the middle of November last year."
从乙烯衍生而来的一价化学基。
从苯甲酸衍生而来的一价化学基。
本文主要介绍有机硼试剂，包括烷基硼烷，烯基硼烷及一些四价硼酸盐类，在碳碳键形成中的应用。
The review deals mainly with the application of organoboron reagents including aikylboranes, vinylborancs and some organoborates in carbon-carbon bond formation.
一种基与中心金属离子(如二价铁离子)结合，形成杂环。
The attachment of a group to a central metallic agent such as iron with two valences to form a heterocyclic ring.
一种基与中心金属离子(如二价铁离子)结合，形成杂环。
The attachment of a group to a central metallic agent such as iron with two valences to form a heterocyclic ring.
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