ymtrans
宁波翻译公司|宁波翻译|宁波外语翻译|宁波专业 ... - 宁波译铭翻译公司
API is not undertaking to meet the duties of employers, manufacturers, or suppliers to warn and ...... Ball valves shall have a spherical obturator that rotates on an axis ...... B.8.2 Trunnion-mounted ball valves and through-conduit gate valves with ... testing of floating-ball valves shall be as follows. a) With the valve half-open, ...
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