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Australia is the second largest country in Oceania and the world's sixth-largest country by total area.

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理想均匀介质中平面声波的声压函数为Pa，式中：的单位为m，的单位为s。那么该声波的波数为（）。 A、rad m B、rad m C、rad m D、rad m

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English is like a bamboo whose stems build upon one another, whereas Chinese is like a tree whose branches are all intertwined.

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