A. be flat (horizontal)
B. slope upward
C. slope downward
D. be U-shaped.
Correct Answer: be U-shaped. ✔
Last Updated: June 11, 2019
A. be flat (horizontal)
B. slope upward
C. slope downward
D. be U-shaped.
Correct Answer: be U-shaped. ✔
Last Updated: June 11, 2019