【简答题】Bamboo is light because of its h______( 空 ) stem..
【简答题】继电器 是一种根据输入信号(电量或非电量)的变化,来 或 小电流电路(例如控制电路),实现 和保护电力拖动装置的电器。
【单选题】Why was it possible for these ancient trees let more light through than modern ones?
A.
Because they were closely spaced, only 3 to 16 feet apart.
B.
Because they were smaller plants and shrubs.
C.
Because their branches did not fan out as far as to form. a shape like umbrella.
D.
Because they had very small leaves like that of fern and dropped easily.
【简答题】在数列1,1,2,3,5,8,13,21,……中,从第三个数起,每个数都是它前面两数的和,在前100个数中,偶数有多少个?在前500个数中,奇数有多少个?
【单选题】在数列1,1,2,3,5,8,13,21,……中,从第三个数起,每个数都是它前面两数的和,在前100个数中,偶数有多少个?在前500个数中,奇数有多少个?
【单选题】在等差数列 3 , 8 , 13... 中,第 5 项为 ( ) .
【单选题】在等差数列{a n }中,a 3 +a 5 +2a 10 =4,则此数列的前13项的和等于 [ ]
【简答题】阅读理解。 1. ______ has the largest population among these countries. [ ] A. Italy B. Australia C. China 2. If you want to visit Big Ben (大本钟), you should travel to ______. [ ] A. Rome B. London C...
【简答题】在数列1,1,2,3,5,8,13。21……中,从第三个数起,每个数都是它前面两数的和,在前100个数中。偶数有多少个?在前500个数中,奇数有多少个?( )。
【判断题】骨髓是机体的造血器官,也是各种免疫细胞的发源地。()