The "increasing payment base" also could relieve the puzzle of pension payment without negative externality but there was such defect as slow implement time or new public financial pressure.
“增加缴费人数”亦可以缓解养老金支付困境，且不存在负外部性，但推行时间缓慢，或将产生新的公共财政压力。
Safe: negative pressure combustion, not against fire, without the danger of explosion, and water, electricity, auto alarm, using PC control.
安全性高：负压燃烧、不逆火、无爆炸之虞，且断水、断电、自动报警，采用PC控制。
The utility model discloses a negative pressure generator used by a water pump suction pipe without a bottom valve.
本实用新型公开了一种无底阀水泵吸水管用负压发生器。
The utility model discloses a negative pressure generator used by a water pump suction pipe without a bottom valve.
本实用新型公开了一种无底阀水泵吸水管用负压发生器。
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