The answer is b
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It was believed that what was called a "quarantine" because a quarantine had less of a military connotation than "blockade".
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Answer:
flapper valves.
Explanation:
According to my research on Aircraft Fuel Tanks, I can say that based on the information provided within the question many fuel tanks incorporate flapper valves. Like mentioned in the question these are implemented to prevent fuel from flowing away from the boost pump or tank outlet. This can happen when the aircraft is experiencing high gravity force/pressure.
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The term "liquidity" refers to how quickly money can be accessed or exchanged.
"Liquid" assets are those that flow freely. If a person or organization has certain amounts of cash on hand, those dollars are liquid and readily can be exchanged for assets or use to pay debts or make purchases. Liquid assets are investments or items that can quickly be exchanged for cash, converted into money that can be used to pay debts or make purchases.