仅在三年前，中国还是煤炭净出口国。

Only three years ago China was a net coal exporter.

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第三节，盆炎净胶囊的抗炎与镇痛作用研究。

The third part, anti-inflammatory and analgesic effect study of PYJC.

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小净距隧道的中间夹岩处于复杂的三维受力状态。

Sandwiched rock between twin closely spaced tunnels is in complicated and three-dimensional stress state.

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小净距隧道的中间夹岩处于复杂的三维受力状态。

Sandwiched rock between twin closely spaced tunnels is in complicated and three-dimensional stress state.

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