如图,某小区花坛的形状是左右对称的六边形ABCDEF,若∠AFC+∠BCF =150°,则∠E+∠D的度数为
A.200°
B.210°
C.230°
D.250°
答案:B
---With 4G mobile phones, people can even see each other as they talk.
----Really? Would you show me it, please?
A.how to use
B.when to use
C.where to use
D.what to use
耐火材料中各种杂质成分,将严重降低耐火材料的耐火度。