In order to assist sinking of well __________ method is used in pneumatic caissons.
A. Air pressure is reduced and Using explosive
B. Using airlocks
C. None of the mentioned
D. All of the mentioned
Answer:A
In order to assist sinking of well __________ method is used in pneumatic caissons.
A. Air pressure is reduced and Using explosive B. Using airlocks C. None of the mentioned D. All of the mentioned