4.灭火器的结构如图所示使用时把手相当于一个 杠杆它推动压杆下移打开气匣阀门.压杆下部制成尖形能够 压强便于将气匣阀门打开当阀门 Template




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tomski4.灭火器的结构如图所示使用时把手相当于一个 杠杆它推动压杆下移打开气匣阀门.压杆下部制成尖形能够 压强便于将气匣阀门打开当阀门 coloring