There are usually no on-line product quality measurements in batch and semi-batch processes, which makes process control very difficult.
间歇生产过程中，很多质量指标不能在线测量，导致过程很难控制。
There are usually no on-line product quality measurements in batch and semi-batch processes, which makes process control very difficult.
间歇生产过程中，很多质量指标不能在线测量，导致过程很难控制。
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