male thread throttle valve
...外螺纹接头 joint with male thread 外螺纹节流阀 male thread throttle valve 外螺纹危险断面抗弯截面模数 bending-resistant section modulus of danger section of external thread ..
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male thread throttle valve
外螺纹节流阀
以上为机器翻译结果，长、整句建议使用 人工翻译 。