It occurs because less oxygen is available in the clay than in the sand.
产生腐蚀的原因是粘土内的氧含量较砂土内的少。
Many NIBCO ball valves are available for oxygen service.
许多美国尼伯科球阀都可用于氧气应用。
Oxygen tanks are also available throughout the premises.
而且在整座建筑物内，到处都备有氧气罐。
Oxygen tanks are also available throughout the premises.
而且在整座建筑物内，到处都备有氧气罐。
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