underground trains are the second cheapest of them and the most c____

相关推荐

• underground trains are the second cheapest of them and the most c____
• 首字母填空,大家快来填.Planes are much faster t______ underground,trains,taxes and buses.Buses are the c____and the slowest of the f_____.Taxes run more quickly than buses,but they are more e_____.Underground trains are not as f_____ as planes,but they run as quickly as trains o_____ the ground.Underground trains are the second cheapest of them and the most c______.
• underground trains are the second cheapest of them and the most c____
• 一道提取公因式的题目18a^2b,-9a^2,4b^2a,6a^3b,-5a^2b^2,36ab^3,4b^2,-8ab,3b,3ab^2含因式2ab的单项式含因式3a的单项式含因式2b^2的单项式
• 空间曲面为球面x^2+y^2+z^2=R^2,计算对面积的曲面积分∫∫(x+y)^2dS