买卖合同无效，那么它对与之相关的票据效力的影响是（）。
A.不影响票据关系效力
B.使票据效力归于无效
C.使票据效力待定
D.使票据效力变更
参考答案：A
My English teacher gave us a suggestion yesterday, _____is often the case, ______ our monitor organize a debate after class.
A．which, which
B．which, that
C．as, that
D．as, which
间接成本是指与成本对象相关联的成本中不能追溯到成本对象的那一部分产品成本。（）
