离散制造业和流程工业的主要区别在哪几方面？
参考答案：
①生产模型；②生产计划；③车间管理；④成本核算。
高血压死亡原因最常见的是（）
A.脑血管意外
B.心肌梗死
C.肾衰竭
D.心功能不全
E.心律失常
— What were you doing when we were playing basketball yesterday afternoon?
— I ______ the classroom.
A．was cleaning
B．have cleaned
C．will clean
D．clean
