矿井通风设施按其作用不同分为引导风流设施、隔断风流设施、调节风流设施。
参考答案：对
_____ of the water _____ polluted. We must try to protect our environment.
A．Two third; are
B．Two third; is
C．Two thirds; are
D．Two thirds; is
开放式基金非交易过户主要包括( )。
A．继承
B．捐赠
C．赎回
D．司法强制执行
