D. Time, cost, and number of changes.
时间，成本，和变更数量。
To order single element substitute "S" for "D" in model number.
如果需要订购单个加热元件，请将型号内的“D”用“S”替换。
Products have been a number of patents, R & D leader in real boiler!
产品已获得多项专利，真正锅炉研发领导企业！
Diameter pitch threads number and range D. p.
径节螺纹种数与范围。
Is Liu Ying Number 2? D. Yes, he is.
刘英是第二号吗？是的，他是。
Is Liu Ying Number 2? D. Yes, he is.
刘英是第二号吗？是的，他是。
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