题干
--Morn, have you finished cooking?
--No, I have added salt to the soup, but it still isn't enough.
A：sweet
B：crispy
C：salty
D：sour
答案(点此获取答案解析）
C
黑磷，黑磷比白磷稳定，结构与石墨相似．下列叙述正确的是（ ）
的三个内角
所对的边分别为
.若
,
,则
的值为