毛利率法
参考答案：
根据企业本期实际销售额与上期或本期计划毛利率匡算本期销售毛利，据以计算本期发出存货成本和期末结存存货成本的在种方法。
We all feel it is Jack as well as his wife that_______for their son’s bad performance at school.
A．are to blame
B．is to be blamed
C．are to be blamed
D．is to blame
氢碳比对合成反应的影响，描述正确的是（）。
A、氢碳比越高越好
B、氢碳比越低越好
C、根据化学计量要求氢碳比一般为2.05～2.15
D、根据化学计量要求氢碳比一般为4～4.2
