面向对象技术中，对象是类的实例。对象有三种成份：（）、属性和方法（或操作）。
A.标识
B.规则
C.封装
D.消息
参考答案：A
All the materials have been posted to you. I’ m looking forward to the chance to meet you __________ to discuss the present situation of our company.
A．in peace
B．in return
C．in trouble
D．in person
酶的激活剂
