单项选择题
A.5° B.8° C.10° D.15°
A.0.4m;150mm B.0.4m;200mm C.0.5m;150mm D.0.5m;200mm
A.0.8m;1m B.0.8m;1.1m C.1m;1m D.1m;1.2m
A.1 B.2 C.3 D.4
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