The most common samples of inorganic materials are the gases of the atmospher...

The most common samples of inorganic materials are the gases of the atmospher...

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I read the local newspapers with great interest every evening.

I read the local newspapers with great interest every evening.

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As is known to all, China is the largest developing country in the world.

As is known to all, China is the largest developing country in the world.

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WHC使用的电源为()A.28VDC;B.115VAC。

WHC使用的电源为()A.28VDC;B.115VAC。

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