为大气型热汽水。
煤烟型大气污染是中国大气污染的主要类型。
Coal-smoke air pollution is the main type of air pollution in China.
LS型直排大气湿式罗茨真空泵属粗真空获得设备。
LS series wet roots vacuum pump is a rough vacuum pumping equipment.
LS型直排大气湿式罗茨真空泵属粗真空获得设备。
LS series wet roots vacuum pump is a rough vacuum pumping equipment.
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