【单选题】【消耗次数：1】
孔板流量计是（ ）式流量计。
①
恒截面、变压差
②
恒压差、变截面
③
变截面、变压差
④
变压差、恒截面
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【单选题】
关于仓库流量计算公式正确的是（）
①
仓库流量＝入库货量／出库货量
②
仓库流量＝出库货量／(入库货量+出库货量)
③
仓库流量=(入库货量+出库货量)/存货量
④
仓库流量=(入库货量+出库货量)/(入库货量+出库货量+存货量)
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