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设X～N(2，22)，Y=aX+b～N(0，1)，则a，b的可能取值为( )．
以u表示孔隙压力,表示总应力,表示有效应力。在加荷的一瞬间,土中的孔隙压力为:()
Britannia Rules Again; A Merseyside Hotel Is Hosting One of the Biggest Aviation Projects Ever and Bringing Back a Famous Airline Name Byline: Peter Elson reportsI MAGINE stepping back into the golden age of travel, arriving at a glamorous hotel set in a great sweeping, stylish airport ter.....
snowtroopers, sandtroopers-–they’re just such stylish bastards.it’s the details that make the outfits work. the cocksure hardiness of that snub-domed stahlhelm headgear always impresses me, as does the smart black ribbing on the barely visible underlay turtlenecks. and so influential!