对于我厂美钢联法热镀锌，下面说法正确的是()。
A. 焊机焊接能力最大厚度为2.0mm。
B. 焊机焊接能力最大厚度为2.5mm。
C. 焊机焊接能力最大厚度为1.2mm。
D. 焊机焊接能力最大厚度为4.0mm。
Which of the following statements concerning fluoride from fluoride-releasing materials is
A. may be elevated in saliva
B. may enhance remineralization
C. may reduce bacteria growth and acid production
D. all of the above
The strength of zinc phosphate cement is linearly related to its()
A. pH
B. powder-to-liquid ratio
C. fluoride content
D. glass content
微信支付 
支付宝支付