【单选题】

The supply and exhaust fans install with V-band clamps. Arrows show the correct direction of flow. The supply and exhaust fans are interchangeablE.

A、进气风扇和排气风扇用V形带扳手安装。箭头显示正确的安装方向。进气风扇和排气风扇不可装反。
B、进气风扇和排气风扇用V形带卡箍安装。箭头指示正确的流向。进气风扇和排气风扇可互换。
C、进气风扇和排气风扇用V形带卡尺安装。按照箭头显示的方向安装。进气风扇和排气风扇是可更换的。