Senior high school mathematics compulsory chapter 2 topic
You ask too many questions, so I will only answer (2) for you here. If you are satisfied, please accept it. If you want to ask another question, please ask it again. Thank you.
A:? Straight AB
b:? Pipeline B 1C 1
c:? Pipeline D 1C 1
Qualified:
A and b are straight lines in different planes.
Line c is parallel to line a.
But as can be seen from the figure, the top and bottom surfaces of C and B are * * *