Material balance equation of gas reservoir is an important method in gas reservoir engineering.
气藏物质平衡方程序，是气藏工程中的重要方法。
Mr. Jones: We usually require a deposit of 10% and the balance in cash against material receipt.
琼斯先生：通常我们先收10%的定金，余款在收到货物时用现金付清。
Mr. Jones: We usually require a deposit of 10% and the balance in cash against material receipt.
琼斯先生：通常我们先收10%的定金，余款在收到货物时用现金付清。
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