【单选题】①a 3 ?a 4 =a 12 ;②(a 3 ) 4 =a 12 ;③a 12 ÷a 3 =a 4 ;④(-a 4 ) 3 =a 12 中,计算正确的个数是( )
【判断题】下面语篇中句(3)是关于most desert dwellers如何取得水分的。 (1)Animals in the desert have a problem getting water and keeping it. (2)Insect-eaters get their liquids from their food. (3)Most desert dwellers avoid the dry...
【简答题】Fill in the blanks by selecting suitable words from the word bank. You may not use any of the words more than once. A. promising B. tempting C. local D. process E. proceed F. comment G charm H. compon...
【单选题】锥形锪钻的锥角有60°, 75°, 90°, 120°。四种,其中最常用的是()。
【单选题】锪孔时,锥形锪钻的锥角有60°、75°、90°、1200°4种,其中用得最多的是()角的。
【单选题】锥形锪钻的锥角有60°、75°、90°、120°四种.以()最常用。