在孔探APU时发现DIFFUSER有严重调块和缺损，应该（）

A.立即换发

B.应根据涡轮压气机状况决定是否换发

C.不必采取措施

D.应根据EGT决定是否更换

The external auditing shall be conducted by the Customs over the following enterprises and other organizations ( ).

A．Enterprises and other organizations engaged in foreign trade only

B．Enterprises and other organizations engaged in domestic trade only

C．Enterprises engaged in the business of inward process only

D．Both A and C