The two main architectural systems of frame construction are a. the skeleton and the post-and lintel. b. the materials and the truss. c. the design and the architect. d. the shell and the skeleton. Please select the best answer from the choices provided A B C D

The object would have to be spherical, orbit the sun, and be traveling in a path with other objects.

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.