A:物质和意识的辨证关系原理
B:矛盾对立统一原理
C:前进性与曲折性相统一原理
D:实践与认识的辨证关系原理
用白铁皮做罐头盒,每张铁皮可制盒身25个,或制盒底40个,一个盒身与两个盒底配成一套罐头盒.现有36张白铁皮,设用x张制盒身,y张制盒底,恰好配套制成罐头盒.则下列方程组中符合题意的是( )
根据材料完成下列各题。BeethovenBorn in 1770 in GermanyA musician (音乐家)Died in 1827Florence NightingaleBorn in Italy on May 12th, 1820An English nurseDied in 1910Bill GatesBorn in I955 in the USAWrote Business @ the Speed of ThoughtOwns MicrosoftThomas EdisonBorn in 1847 in the USAMade over 1,000 inventions (发明)Died in 1931Yao MingBorn on September 12th, 1980 in Shanghai, ChinaA basketball playerPlayed for the Houston Rockets, the USA
18世纪以后,为强化农奴制,沙皇采取的措施有①采取措施扩大农奴数量 ②允许私营企业主购买整个村庄的农奴单位③颁布法令宣布封建地主占有土地和农奴是其不可侵犯的特权④农奴在法律上获得人身自由