“神舟”七号太空行走

“神舟”七号太空行走成功后，大大鼓舞了全国人民的爱国热情，飞船表面的烧蚀材料中含有氮化硅。己知氮、(]2['~3K-C7M-@(G

硅的原子结构示意图依次为（见下图）， 则氮化硅的化学式可能是 请选择ABCD3p4j5T5I8m6`+E(]2['~3K-C7M-@(G

(]2['~3K-C7M-@(G

A. Si3N4(]2['~3K-C7M-@(G

B. Si4N3(]2['~3K-C7M-@(G

C. SiN2(]2['~3K-C7M-@(G

D. SiN(]2['~3K-C7M-@(G