The indicators that characterize the degree of patchiness of the landscape pattern is （ ）.

多选题

The indicators that characterize the degree of patchiness of the landscape pattern is （ ）.

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单选题

In case of fire, ____ will close automatically, preventing additional oxygen to enter the space to fuel and spread a fire.A. the fire dampers B. the indicatorsC. the watertight doors D. the ventilators

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单选题

Do the procedure that follows.

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单选题

The scientist Galileo claimed that the earth_____around the sun.(2.0)

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问答题

costly; our schools fail too many; and each day brings further evidence that the ways we use energy strengthen our adversaries and threaten our planet.　　These are the indicators of crisis, subject to data and statistics. Less measurable but no less profound is a sapping of confidence across our land—a nagging fear that America’s decline is inevitable, and the next generation must lower its sights. Today I say to you that the challenges we face arc real. They are serious and they are many. They w

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