以下（）项可以提高应变片测量电桥的输出电压灵敏度。

答案查看网，轻松搜题/搜资源

【单选题】【消耗次数：1】

① 在应变片功率范围内降低电桥供电电压

② 不受应变片功率限制提高电桥供电电压

③ 不受应变片功率限制降低电桥供电电压

④ 在应变片功率范围内提高电桥供电电压

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