出现颅内高压危象，首选的紧急处理是
A
暂无解析
设二次型f(x1,x2)=x12+4x1x2+4x22经正交变换化为二次型，求ab的值。
EachyearintheUnitedStates,manyblackteenagers_______ofschool,eitherbecausetheycannotkeepuportheyhavetoworktosupporttheirfamily.
中国民族资产阶级在社会主义革命时期的两面性是___________。
Constructionoftherailwayshelpedtodevelopthenational_______ofTanzaniaandZambia.
Thedirectorrecommendedthatshe________(study)moreEnglishbeforegoingabroad.