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A．Dr. Collin.
B．Spray cans.
C．A new type of fuel.
D．A test.
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A．The weakness of the price system.B．The complexities of the price system.C．Credit terms in transactions.D．Resource allocation and the public service
A．The weakness of the price system.
B．The complexities of the price system.
C．Credit terms in transactions.
D．Resource allocation and the public service
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