孔管的安装
orifice tube installation
锥孔的管塞
Filler plugs for trepanned holes
冷却器软管更换程序
coolant hose replacement procedure
变量的更换
change of the variable
transformation of the variable
次级燃油滤清器滤芯的更换
secondary fuel filter element replacement
大修零件的更换
overhaul parts replacement