单项选择题
A.手动 B.控制 C.手动和自动 D.自动
A.1.3 B.1.5 C.1.3-1.5 D.1.7
A.1m B.1.2m C.1.5m D.2m
A.9m,50-100mm B.9m,75-150mm C.12m,50-100mm D.12m,75-150mm
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