对于占用资源很多的sql语句，查看实际的变量值(字符)而不是参数标记也许对优化器较为有益。
For very expensive SQL statements, the optimizer may benefit from seeing actual variable values (literals) instead of parameter markers.
本实用新型的有益效果：框柄可以180度旋转，方便实用，存储方便，占用空间小。
The storage frame has the beneficial effects that the frame handle can rotate by 180 degrees, and the storage frame is convenient and practical and has convenient storage and little occupied space.
有益效果是减小空调装置蒸发器占用的空间，使其更加紧凑，出口风速分布均匀。
The beneficial effects are that the space occupying of the evaporator of the air-conditioner is decreased, the structure is more compact, and the wind speed at the air outlet is uniformly distributed.
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