【单选题】下列各组物质中互为同系物的一组是
B.
CH =CH-CH 和CH =CH-CH -CH
【判断题】import random r1 = random.choice(range(100))+1 print(r1) 这个程序的输出结果是100内的随机数。
【单选题】下列物质中与CH3OH互为同系物的是( )
【单选题】what are they doing ?
A.
They are taking photos.
B.
They are cutting or editing films.
【简答题】>>> import math >>> import random >>> import posixpath as path >>> print(math.sqrt(16)) >>> print(math.cos(math.pi/4)) >>> print(random.choices('abcd',k=8)) >>> print(path.isfile(r'C:Windowsotepad.exe...