城镇燃气管道的设计压力分级中,高压A燃气管道为2.5MPaP≤4.0PMa
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五(1)班有学生50人,其中有女生21人,男生占全班人数的几分之几?
me(主格)__________
many,minutes,hour,there,how,are,in,an
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Look!Lucyis______anewreddress.Sheisbeautifultoday.
things,in,are,the,now,the,car
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