适用于水及煤气等压力流体的输送 [复制链接]

　　　　29、In the life long journey with many detours, path, dangerous road, dark road, only the strong-willed and never stop the people, will have hopes of reaching the victory away.

50、有勇气并不表示恐惧不存在，而是敢面对恐惧、克服恐惧。