r=2area=3.14*r*rprint(area)上述程序的功能是计算元的面积并输出。

配置OSPF时，必须要具有的网络区域是（ ） A: area 0 B: area 1 C: area 2 D: area 3

输入一个表示半径的浮点数，计算圆的面积的程序正确的有：[br][/br] （圆周率取使用math库中的pi值，结果保留2位小数） A: import math <br> radius = float(input()) area = math.pi * radius ** 2 print(round(area, 2)) B: import math <br> radius = float(input()) area = pi * radius ** 2 print(round(area, 2)) C: from math import pi <br> radius = float(input()) area = math.pi * radius ** 2 print(round(area, 2)) D: from math import pi <br> radius = float(input()) area = pi * radius ** 2 print(round(area, 2))

OSPF把网络划分为四种区域，其中（ ）区域是骨干区域。 A: area 0 B: area 1 C: area 2 D: area 3

输入一个表示半径的浮点数，计算圆的面积的程序正确的有：（圆周率取3.14，结果保留2位小数） A: radius = float(input())area = 3.14 * radius ** 2print(round(area, 2)) B: radius = float(input())area = 3.14 * radius * radiusprint(round(area, 2)) C: radius = input()print(round(3.14 * radius ** 2, 2)) D: radius = float(input())print(round(3.14 * radius * radius, 2))

The leaf area index can be defined as the A: A, green leaf area/yellow leaf area B: B, land area/leaf area C: C. Total green leaf area/land area D: D, yellow leaf area/green leaf area

According to the situation and the route, which activity area is the reading area next to? A: Intelligence area B: Construction area C: Performance area D: Role-play area

According to Nanjing’s 1929 “Capital Plan”,the urban area was divided into six areas: central administrative area,municipal administrative area,industrial area,commercial area,cultural and educational area,and residential area.

def area(r, pi=3.14):return round(pi*r*r,2),the value of area(pi=3.14, r=4) is A: 50.24 B: 39.44 C: 50 D: 39

Pit No. 2 was discovered much later, covering an area of about 5,000 square meters.