【简答题】根据下面各数列前几项的值,写出数列的一个通项公式: (1) , , , , ,… (2) ,2, ,8, ,… (3)5,55,555,5 555,55 555,… (4)5,0,-5,0,5,0,-5,0,… (5)1,3,7,15,31,…
【单选题】任意形状物体在无自由液面的不可压缩粘性流体中作匀速直线运动时,受到的阻力由:( )即可完全决定。
【单选题】It took me __ days to finish drawing a beautiful horse. A. a half dozen B. half a dozen C. haft dozens D. half dozen
【简答题】A.One dozen. B.Two dozen. C.Three dozen. D.Four dozen.
【简答题】写出下面数列的一个通项公式,使它的前4项分别是下列各数: (1) l ,2 ,3 ,4 ; (2) ,,,, (3)5,55,555,5555.
【单选题】She wants _____.
A.
three dozen of these eggs
B.
three dozens of these eggs
C.
three dozen of this eggs
D.
three dozen of these egg.
【简答题】A.A dozen roses, two dozen balloons and a romantic dinner. B.A dozen roses, a beautiful card and a romantic dinner. C.Two dozen roses, a dozen balloons and a romantic dinner. D.Two dozen roses, a beau...
【单选题】She went to the bookstore and bought________. [ ]