ventilator 通风设备
fan 风机
vent 通风管
funnel cap 风帽
seat 底座
window shutter 百页窗
exhaust fan 抽风机
blower 送风机
Manhole cover 三、人孔盖
flush manhole cover 平板式人孔盖
hinged manhole cover 铰链式人孔盖
raised manhole cover 凸起式人孔盖
sunken manhole cover 埋入式人孔盖
fender guide 保护导架
lashing unit 绑扎单元
davit arm 吊臂
skidplat 翻板
overview R.C. sheave houses 滑轮机构
