mass flow characteristic的用法和樣例：
例句
- Flow curve tending to straight line.excellent regulation performance.
流量特性趨於直線，調節性能好。 - Throttling is not recommended because partially open gate valves exhibit flow characteristics not conducive to accurate and consistent flow control.
不建議用於節流應用，因為部分開啟的閘閥所表現的流量特性並不利於精確和一致的流量控制。
