单项选择题
A.BLV-1*2.5 B.BV-1*1.5 C.BV-1*2.5 D.BX-1*1.5
A.1.8m B.2.0m C.2.4m D.3.0m
A.6根 B.8根 C.10根 D.12根
A.-10—+10% B.-10—+20% C.-5—+10% D.-5—+20%
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