Vitamin D is essential in the development and maintenance of teeth and bones. A lack of Vitamin D has been linked to Osteoporosis.
维生素D是牙齿和皮肤的生长和维护的必要元素。如果缺乏维生素D，是很容易得骨质疏松症的。
Transfer of OAM (Operations, Administration and Maintenance) information for reserved and permanent services may be provided via a D-channel in another interface structure.
用于预留和永久业务的OAM信息的传递可以通过在其他接口结构中的一个D信道传送。
D type boiler is widely used in petrochemical industry because of its characters of compact construction, less area occupied, short site installed period, easy operating and maintenance.
型锅炉以其结构紧凑，占地小，安装周期短，运行维护方便等特点，在国内石油化工系统得到了广泛的应用。
Transfer of OAM (Operations, Administration and Maintenance) information for reserved and permanent services may be provided over a D-channel in the same or in another interface structure.
用于租用和永久业务的OAM信息的传递可以通过在其它接口结构中的一个D信道传送。
Zhongjia MRO company in February 26th , 2007 was issued the "maintenance permit" (D. 200088) from China General Administration of Civil Aviation Authority in east China.
中加公司于2007年2月26日获得由中国民航总局华东地区管理局颁发的《维修许可证》（D.200088号）。
Conclusion Strict operation and timely maintenance of sterilizers can reduce the failure of B-D tests.
结论严格执行操作规程，灭菌器出现故障及时检修，可减少B- D试验失败。
It's a very practical attempt adopting wholly new control method change the special power afforded by the A. C. arc welder to the controlled D. C. power required in automobile maintenance.
采用一种全新的控制方法，将交流弧焊器所提供的特种电源转换成汽车修理所需的可控直流电源，是一种具有实用价值的尝试。
DCS-Z-D-50 double-bucket packaging scale has quick packaging and high accuracy. It is digital, readable, easy maintenance.
DCS-Z-D-50 双斗包装秤，包装速度快，计量精度高，数字显示，直观易读，稳定可靠，维护方便。
DCS-Z-D-50 double-bucket packaging scale has quick packaging and high accuracy. It is digital, readable, easy maintenance.
DCS-Z-D-50 双斗包装秤，包装速度快，计量精度高，数字显示，直观易读，稳定可靠，维护方便。
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