MM
Mashaal Masha
Jan 09, 2024
In 2015, a team led by materials scientists Anirudha Sumant and Diana Berman succeeded in reducing the coefficient of friction (COF) between two surfaces to the lowest possible level--superlubricity. A nearly frictionless (and, as its name suggests, extremely slippery) state, ________
Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Hard
A:
when their COF drops below 0.01, two surfaces reach superlubricity.
B:
two surfaces, when their COF drops below 0.01, reach superlubricity.
C:
reaching superlubricity occurs when two surfaces' COF drops below 0.01.
D:
superlubricity is reached when two surfaces' COF drops below 0.01.
ID: 659d9c89161c1373e8b83939