单项选择题
A.50mm B.100mm C.120mm D.150mm
A.8mm B.10mm C.12mm D.14mm
A.750°C B.900°C C.1200°C D.1350°C
A.厚壁钢管 B.薄壁钢管 C.金属波纹管 D.普利卡金属套管
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