下列()不属于一类高层建筑。
A、建筑高度超过50m商住楼
B、藏书80万册的图书馆
C、建筑高度超过50m的教学楼
D、省级广播电视楼
参考答案:B
I really don't know how to thank you, but for your help, I ________ my lost necklace.
A.couldn't have found
B.mustn't have found
C.couldn't find
D.wouldn't find
许旺氏细胞是()
A、神经细胞
B、神经胶质细胞
C、结缔组织细胞
D、腺细胞