单项选择题
A.67KB.64KC.70KD.72K
A.减小HPT叶片与机匣间间隙以提高效率B.防止HPT叶片过热烧蚀C.调节HPT出口气流D.N/A
A.HPC 7THB.HPC 9THC.HPC 5THD.LPC 4TH