对于我厂美钢联法热镀锌,焊接小车移动速度为()。
A. 0~15m/min
B. 0~18m/min
C. 0~19m/min
D. 0~25m/min
Packable resin composites()
A. have been marketed as amalgam alternatives
B. always contain fluoride
C. can be adequately polymerized to a depth of 5 mln using a halogen light-curing unit
D. come in a broader range of shades than standard resin composites
对于开卷操作,下面说法不正确的是()。
A. 伸出并下降开卷刀,缓冲辊下降压住钢卷,压下磁力皮带。
B. 开卷机反转,使带头处于开卷机上方
C. 使开卷机正转,使带头通过开卷刀而进入夹送辊、矫直机。
D. 打开夹送辊,矫直机。
What is the difference between shrinkage and shrinkage force?