弥补财政赤字的主要办法()
A.增加纸币发行
B.增加税收
C.发行公债
D.节约政府开支
E.提高利率
参考答案:A, B, C
We_______such great progress without your efforts. Thanks a lot.
A.shouldn’t have made
B.couldn’t have made
C.were unable to make
D.mustn’t have made
如果SDH传输设备发生了故障,请简述一般的维护步骤及方法。