JZ-7型空气制动机制动管的过充压力是在（）排风口处逐渐消失的。

A、三通阀

B、中继阀

C、分配阀

D、减压阀

A Direct Method teacher is usually found using techniques such as （）.

A. direct association and conversation practice

B. question and answer exercises

C. error correction and dictation

D. all of the above