n.定容计时阀 fixed-volume metreing valve: 定容计时阀fixed-volume metering valve: 定容计时阀brake metreing valve: 闸板调节阀fixed overhead volume variance: 固定间接费用业务量差异; 固定制造费用产量差异fixed volume fed-batch: 定体积补料分批发酵下载手机词典可随时随地查词查翻译