属于大环内脂类药物有（）
参考答案：红霉素、阿奇霉素、乙酰螺旋霉素、罗红霉素
The scientists have made _______ possible for us to communicate with each other more easily.
A．it
B．that
C．this
D．them
合伙企业的事务如何执行？
