下列哪项不是高钙血症的病因
A．甲状旁腺功能亢进B．维生素E中毒C．恶性肿瘤D．维生素D中毒E．维生素A中毒
参考答案：B
The hurricane damaged many houses and business buildings; it caused 20 deaths. [ ]
A. or else
B. therefore
C. after all
D. besides
蒸汽轮机有什么优点？
