节流元件包括（      ）。   

A、<span style="font-size:16px;font-family:宋体">弹簧管&nbsp; &nbsp;&nbsp;</span>

B、<span style="font-size:16px;font-family:宋体">孔板&nbsp; &nbsp;</span>

C、<span style="font-size:16px;font-family:宋体">喷嘴&nbsp; &nbsp;&nbsp;</span>

D、<span style="font-size:16px;font-family:宋体">文丘里管&nbsp; &nbsp;</span>

E、<span style="font-size:16px;font-family:宋体">波纹管</span>