国产欧美在线视频免费_精品午夜视频_国产精品福利网站_国产啪精品视频网免费,国产成人精品综合久久久久性色,亚洲国产精久久久久久久,日韩超碰人人爽人人做人人添

First : according to user demand, sales of machinery and equipment, the most economical and reasonable purchase plan.
Second : according to user requirements, provide the relevant technical documents, according to the contract requirements of quality and quantity, on schedule to fulfill the contract to ensure that each user timely use of diesel generator quality.
Third, customer service:
1 warranty period:
2 technical service: we provide technical information of product manual, parts manual complete free, and detailed training materials. Free to send technical experts to the scene for skilled technical guidance and installation and commissioning, until the normal use of delivery.
3 parts, service: provide free parts, long-term supply of spare parts and components.
4, maintenance services:
5, the principle of service: