安装两个垫片，每个3.5毫米厚。
A Install two mats, each 3.5 mm thick.
B Install two spacers, each 3.5 mm thick.
C Install two rings, each 3.5 mm thick.
A Install two mats, each 3.5 mm thick.
B Install two spacers, each 3.5 mm thick.
C Install two rings, each 3.5 mm thick.