Closed-ring contours indicate that the ground within the ring is ( ).
A: lower
B: higher
C: equal
D: either A orB
A: lower
B: higher
C: equal
D: either A orB
举一反三
- Helen gave her daughter （） A: a ring B: to a ring C: for a ring D: with a ring
- Ignoring the__________ ring, she put the chicken in the oven and closed the door.
- The Ring of the Nibelung is generally known as the Ring or the Ring Cycle.
- A ring homomophism f from a ring R onto another ring S is an isomophism if and only if kerf=0.( )
- The compressive strength of brittle materials is generally （ ） than its tensile strength.。 A: higher B: equal C: lower