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Answer:
Roman engineers used inverted siphons to move water across a valley if they judged it impractical to build a raised aqueduct. The Roman legions were largely responsible for building the aqueducts. Maintenance was often done by slaves. The Romans were among the first civilizations to harness the power of water.
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Answer:
I think its A.Once South Vietnam surrendered, the rest of Southeast Asia soon fell to communist invaders. B. The Vietnamese wanted to be free of all foreign influence.
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