据资料分析,某厂生产的一批砖,其抗断强度X~N(32.5,1.21) ,今从这批砖中随机地抽取了 9 块,测得抗断强度 ( 单位: kg/cm2)的平均值为 31.12 ,问这批砖的抗断强度是否合格
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Thegreatuseofschooleducationisnotsomuchtoteachyouthings_____toteachyoutheartoflearning.
Weneedamorecapableleader,______withstrongwillandaswellasgoodhumour.
Manypeopleattendvariouspubliclectures,chiefly______themselvesfamiliarwiththelatestdevelopmentofdifferentfields.
简述法律的基本特征。
已知a,b为常数,时为等价无穷小,求a,b .