This study is a multicenter, randomized, open, parallel-controlled study. Qualified subjects will randomly be assigned to the experimental arm or the control arm according to the ratio of 1:1, with age (\> 60 years or ≤ 60 years), smoking status (yes/no) and forced expiratory volume in one second/prediction (FEV1 %pred \> 60% or ≤ 60%) as the random stratification factors.
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(VO2max)
Timeframe: The change from baseline in maximum oxygen consumption (VO2max) at maximum exercise load at Week 12 of treatment.