Pneumatic structures are:1. Membrane structures2. Stabilized by compressed air3. Characterized by internal pressure being less than external pressure4. Characterized by internal pressure being equal to or more than external pressureSelect the correct answer using the codes given below:

Pneumatic structures are:1. Membrane structures2. Stabilized by compre

1.	Pneumatic structures are:1. Membrane structures2. Stabilized by compressed air3. Characterized by internal pressure being less than external pressure4. Characterized by internal pressure being equal to or more than external pressureSelect the correct answer using the codes given below:
A.	1, 2 and 3
B.	1, 2 and 4
C.	2 and 4 only
D.	1 and 4 only
Answer» C. 2 and 4 only

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Pneumatic structures are:1. Membrane structures2. Stabilized by compressed air3. Characterized by internal pressure being less than external pressure4. Characterized by internal pressure being equal to or more than external pressureSelect the correct answer using the codes given below:

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