问下各位发动机SAC和DAC如何判断

myj2057

-5B7/3是SAC（单环形燃烧室） ，压气机和高压涡轮叶片是3D设计的，在5B的 ENGINE SHOP MANUAL 的Introduction  里面有提到：
The CFM56-5B engine models are divided by two primary
configurational differences. The compressor/HPT assemblies
are divided into 3D aero and non 3D aero configurations and
the combustor assemblies are divided into single annular
combustors (SAC) and dual annular combustors (DAC). The
different combinations of these configurations and the
applicable models are divided into the EFFECT. codes listed
below.

ESM截图