运用讲授法的基本要求是什么
参考答案：(1)讲授内容要有科学性、系统系和思想性。(2)注意启发。(3)讲究语言艺术。
At the party the host presented an award to ______ took part in saving the drowning child.
A．whomever
B．whom
C．who
D．whoever
简述成本核算的四大原则。
