混凝土拌和物经真空脱水处理后，早期强度提高，拆模时间提前，可提高工效。
The concrete mixtures treated by vacuum water free can enhance the early stage strength, form release time and working efficiency.
通常还有一个真空装置，用于检查真空点火提前装置的工作情况。
In addition, they usually have a vacuum device to test the operation of vacuum-advance mechanisms.
通常还有一个真空装置，用于检查真空点火提前装置的工作情况。
In addition, they usually have a vacuum device to test the operation of vacuum-advance mechanisms.
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