单项选择题
A.不大于1m/s B.不大于2m/s C.不大于3m/s D.不大于10m/s
A.高于热风压力0.15MPa B.大于热风压力0.25MPa C.大于热风压力0.10MPa
A.0.1MPa B.0.15MPa C.0.35MPa D.0.5MPa
A.1/2 B.2/3 C.末端
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