有四根通气管,管径分别为2×100mm,2×75mm,现用汇合通气管将四根通气管汇合在一起伸出屋顶,则汇合通气管所需最小公称直径为()。
A、DN100B
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重写句子:Attheinternationalmuseum,youcanfindancientEgyptianart.YoucanexploreAfricanartifactsthere.Youcandiscoverbeautifultextilesfromaroundtheworldthere.(parallelstructure)
Ifanearthquakeoccurred,someoftheone-storeyhouses________.
Hewas______towithdrawfromrunningforthepresidency.
Itisdifficultto________theimplicationbetweenthelines.
Beingextremely_____tothecold,Idonotlikeskating.