Dan was lost in the desert for 2 days and didn’t drink for 54 hours

某双链DNA中已知一条链中A为30%、G为24%,其互补链的碱基组成是 A: T和C 为46% B: T和C为54% C: A和G为54% D: T和C 为60% E: A和C 为54%

已知某DNA的一条链中A=30%,G=24%,其互补链的碱基组成是:(<br/>) A: T和C为46% B: C和G为46% C: A和G为54% D: T和C为54% E: T和C为60%

下列程序的运行结果是（ ）。t = 0 while t &lt; 5: print(t, " is less than 5") t = t + 1else: print(t, " is not less than 5") A: 0 is less than 51 is less than 52 is less than 53 is less than 54 is less than 55 is not less than 5 B: 1 is less than 52 is less than 53 is less than 54 is less than 55 is less than 55 is not less than 5 C: 0 is less than 51 is less than 52 is less than 53 is less than 54 is less than 5 D: 1 is less than 52 is less than 53 is less than 54 is less than 55 is less than 5

边形内角和为720°00′54″，则内角和的真误差和每个角改正数分别为（）。 A: ＋54″、＋9″ B: －54″、＋9″ C: ＋54″、－9″ D: －54″、－9″

已知三叉树T中6个叶子结点的权值分别是2,3,4,5,6,7，T的带权路径长度最小是（ ）。 A: 27 B: 46 C: 54 D: 56

六边形内角和为720。00‘54”，则内角和的真误差和每个角改正数分别为______ A: ±54”、 ±9” B: 一54”、 十9” C: 十54”、 一9” D: 十54”、 一9”

把1～54这54个数从小到大排成一行（如表），

17e0c8854182f22.jpg如图所示，统计A列中大于54的单元格个数，下列选项中正确的是（）。 A: =COUNTIF(A2:A10,">;54") B: =COUNTIFS(A2:A10,">;"&amp;54) C: =COUNTIFS(A2:A10,">;54") D: =COUNTIFS(A2:A10,">;"&amp;"54")

若质点A按照规律[img=45x21]1786967c9946136.png[/img]运动，则在t=3时的瞬时速度为（ ） A: 81 B: 54 C: 18 D: 6