【单选题】选择过滤器时,空气过滤器的处理风量应( )其额定风量。
【单选题】If the president wants to put a treaty into effect, he has to get the approval by two thirds of the _____.
【判断题】空气过滤器的处理风量应小于或等于额定风量
【单选题】高效空气过滤器的实际处理风量应________其额定风量。
【单选题】现行国家标准对于空气过滤器的选用、布置和安装方式做出若干强制性的规定,以下对有关强制性规定理解错误的是哪一项?
A.
空气净化器应根据空气洁净度等级合理选用空气过滤器
C.
中效(高中效)空气过滤器宜集中设置在空调系统的正压段
D.
亚高效、高效和超高效空气过滤器必须设置在净化空调系统的末端
【单选题】4) The president wants to see their national flag _______ on the surface of Mars by 2019.
【单选题】The president wants to see their national flag ______ on the surface of Mars by 2019.
【单选题】在选择过滤器时,空气过滤器的处理风量应( )其额定流量。
【单选题】The president wants to improve the nation's highways and mass ____________ systems.
【简答题】诗人冯至借助 “蛇”这个意象,抒发了怎样的感受和渴望?