单项选择题
A.1m B.0.5m C.1.5m D.2m
A.40℃ B.30℃ C.20℃ D.25℃
A.流程 B.手柄 C.阀门
A.18.5-20%；≤12ppm；≤36ppm B.19.5-21%；≤10ppm；≤35ppm C.19.8-21%；≤10ppm；≤36ppm D.19.5-23%；≤10ppm；≤36ppm
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