What principle do boilers use to assist fluid circulation?
A) Kinetic principle
B) Differential density
C) Mechanic principle
D) Hydro effect
Answer: B
Explanation: A) Incorrect. Boilers use the principle of differential density to assist fluid circulation.
B) Correct. Boilers use the principle of differential density to assist fluid circulation.
C) Incorrect. Boilers use the principle of differential density to assist fluid circulation.
D) Incorrect. Boilers use the principle of differential density to assist fluid circulation.
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