实验室存放化学品不得使用哪类冰箱（）
A.机械温控冰箱
B.电子温控冰箱
C.防爆冰箱
参考答案：A
his financial problems , his wife also left him , which made him very depressed .
A．In case of
B．Except
C．On top of
D．On account of
食物中一般都含有______、______、______以及维生素、无机盐、水等人体必需的营养物质．
