单项选择题
A.1×0.6L/minB.1×0.8L/minC.1×0.9L/minD.1×1.0L/min
A.1000mmB.1300mmC.1400mmD.1500mm
A.0.2m3B.0.4m3C.0.6m3D.0.8m3
A.45°B.90°C.135°D.180°
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