合同双方约定工程总价7500万元。定金为主合同标的的25%，该定金条款无效。()
参考答案：错
解析：参见教材P363
—Physics _______ more difficult than Chinese, do you think so?
—Yes, I think so.[ ]
A. is
B. are
C. has
采用计划成本法核算原材料的企业，日常收到原材料时应按实际成本借记“原材料”科目，领用或发出原材料时应按计划成本贷记“原材料”科目，期末再将发出材料和期末结存材料调整为实际成本。( )
