单项选择题
A.600-1250mm B.700-1550mm C.600-1200mm D.700-1250mm
A.＜300us/cm B.＜350us/cm C.＜400us/cm D.＜200us/cm
A.1000 B.1100 C.1200 D.1300
A.25 B.28 C.30 D.32
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