在利用朗格系数法编制投资估算时，通常以( )为基数。
A．设备费
B．工艺设备投资
C．直接建设成本
D．建筑安装工程费
参考答案：A
（）是指当年到期还本付息的国债总额占当年财政收入的比例。
A.国债相对规模
B.国债依存度
C.国债负担率
D.国债偿债率
As a young man, Comrade Zhou Enlai ________ the students' movements and later ________ the Communist Party of China.
A．joined; took part of
B．took part in; joined
C．joined in; took part in
D．took part of; joined
