Must be suitable for a safe landing in all valid wind conditions.

必须适合安全的降落在所有有效的风力条件。

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All valves to be suitable for double block and bleed service.

所有阀门需有双堵塞和双排放功能。

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All valves to be suitable for double block and bleed service.

所有阀门需有双堵塞和双排放功能。

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