(A) Thin walled having the value of Ao Ai/< 2
(B) Thick walled
(C) Having the value of Ao/Ai > 2
(D) Both
(A) Thin walled having the value of Ao Ai/< 2
(B) Thick walled
(C) Having the value of Ao/Ai > 2
(D) Both
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