The special customized power equipment provided by the company mainly includes lighthouse unit, water pump unit, natural gas unit, lighthouse water pump integrated machine, high-speed mobile power station, container power station, etc.
The marine ultra quiet generator produced by our company has the characteristics of low noise, low fuel consumption, simple and convenient maintenance, etc. it is designed and produced according to the military standard and provides customized service.
The on-board ultra quiet generator set developed and produced by our company is mainly used in relevant special vehicles, and can provide customized service. The product is reliable in quality, low in noise, maintenance oriented, and highly humanized, and can compete with foreign brand products.
The company's production of land ultra quiet generator sets, ultra quiet generator set applications and high noise requirements of the place, all products can compete with imported brands.
The company's silent generator sets, silent generators using the most advanced European technology design, Seiko build. New appearance, high degree of humanization, noise control at the lowest level in the industry, price concessions, this product sells well in Europe and America, is your ideal choice.
数据库优化的目标无非是避免磁盘I/O瓶颈、减少CPU利用率和减少资源竞争。 1、 在业务密集的SQL当中尽量不采用IN操作符 2、 不使用not in 因为它不能应用表的索引。用not exists 或(外连接+判断为空)代替 3、 不使用，因为用它只会产生全表扫描。(a0改为a0 or a0) 4、 不使用 is null 或 is not null 判断字段是否为空一般不用到索引。(a is not null 改为a0) 5、 用a=3代替a2，因为a2时，会先找出a为2的记录索引再进行比较，而a=3时，会直接找到a=3的索记录引再进行比较。 6、 尽量不使用like %005%(比如前面的%确定在{A,B}内，用A005% or B005%代替...
