A.2mm B.10mm C.15mm D.20mm
A.100° B.120° C.165° D.200°
A.1% B.3% C.5% D.10%
A.1 B.2 C.3 D.5
A.灭火器报废 B.灭火器维修 C.灭火器验收 D.灭火器安装
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