单项选择题
A.250-350mm B.200-250mm C.250-300mm D.300-350mm
A.90° B.60° C.45°
A.200-300mm B.150-200mm C.150-250mm
A.0.15-0.3L/min B.0.15-0.2L/min C.0.2-0.3L/min
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