Defining the local column as DATE is convenient because it allows predicates that involve DATE literals, but does not require casting functions (which tend to impact performance).
将本地列定义为DATE类型比较方便，因为这样可以允许涉及DATE文字但是不需要覆盖函数(对性能有影响)的谓词。
The use of vibration and impact to the mold casting equipment in separation of molding sand and casting.
利用振动和冲击使铸型中的型砂和铸件分离的铸造设备。
The wear resistance of casting composite medium manganese steel has been studied under the condition of impact abrasive wear.
研究了铸造复合中锰奥氏体钢在冲击磨料磨损条件下的耐磨性能。
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