The utility model has the advantages of compact structure, long service life, big driving torque and small loss of driving power and small maintenance ratio and can realize the replacement of gears.
本实用新型具有结构紧凑、使用寿命长、传动扭矩大且传动功率损失小的优点，它可以实现挡位的更换，维修率小。
Maintenance of continues low level nitrate with sufficient supply of phosphate, namely low N:P ratio, may facilitate the growth of Alexandrium tamarense.
维持培养液中适当低的氮水平，并保证足够量的磷供应即较低的氮磷比是促进塔玛亚历山大藻生长的重要原因。
The ratio of the maintenance costs in the power costs is increasing.
维修费用占电力成本的比例也不断提高。
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