________ type of cofferdam is economical at places where rock is available in plenty.
A. Earth dikes
B. Sand-bags dikes
C. Rock-fill cofferdam
D. Single wall cofferdam
Answer:C
________ type of cofferdam is economical at places where rock is available in plenty.
A. Earth dikes B. Sand-bags dikes C. Rock-fill cofferdam D. Single wall cofferdam