氮化硅(Si 3 N 4 )是一种新型陶瓷材料的主要成分,耐高温,常用于制造业、航天领域.Si 3 N 4 中硅元素(Si)的化合价为 ( )
A.
+2
B.
+3
C.
+4
D.
﹣4
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【判断题】The English Civil War, also called the “Great Rebellion” or “English Revolution”, was a series of armed conflicts and political machinations between Royalists and Parliamentarians over principally the...
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