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Chemistry
containing
面对面
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凸面对焊法兰
raised face welding neck flange
单面焊对接接头
single-welded butt joint
双面 V 形对焊接
double V butt joint
对角滑移面 n
diagonal glide plane n
环槽式密封-面对焊法兰
ring joint welding neck flange
镜面反射对称
reflection plane symmetry
镜面反射对称
mirror reflection symmetry
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