局部通风的方法有扩散通风、（）、引射器通风和局部通风机通风。
参考答案：全风压通风
俄罗斯人到哈尔滨参加“哈洽会”，最有可能采购的商品是 ( )
A．铁矿
B．木材
C．服装
D．钢材
We have lived here for _____.[ ]
A. two years and a half
B. two and half a years
C. two years and half one
D. two and one half year
