1.2.5-132 What are the requirements of IEC standard and SPC design for leakage of external sealing ring of pitch bearing?<br> 2. Is this sealing ring replaceable on the tower? Please provide replacement WDI?<br> 3. Due to the serious oil extravasation that can't be cleaned in time, the environment is polluted and the lumps fall from the sky. Is it fundamentally solved according to EHS requirements?
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