我国原发性肝癌最常见的病因是（）
A.乙型肝炎
B.肝结核
C.酒精性肝硬化
D.胆汁性肝硬化
E.肝脓肿
参考答案：A
下列哪项不是植物生长需要量最多的三种无机盐（ ）
A．含氮的无机盐
B．含磷的无机盐
C．含钾的无机盐
D．含铁的无机盐
Which of the following arises when a company incurs expenses that have not yet been paid as of the end of an accounting period
A. Prepaid expense.B. Accrued expense.C. Unearned revenue.
