缺点主要是设备费用高，管道易被泥沙、盐分结晶或藻类植物堵塞。
The disadvantages are mainly high equipment costs and plugging of the lines by sediment, salt encrustation, or algae.
这样，每一个人的活动折扣和所有包括保险和主要设备的总费用。
With that, each individual activity is discounted and all include insurance and major equipment in the total cost.
预防性维修属于一种主动维修，其主要目的是延长设备寿命、延长设备无故障时间、降低设备全寿命费用。
As a kind of initiative maintenance, preventive maintenance mainly aims at prolonging service life of medical equipment, extending their fault-free time and lowering the whole life expense.
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