介绍一种晶体管恒流全新触发连续固体激光器氪灯电源。
A power supply of continuous solid laser krypton lamp using a new touching off system and transistor constant current circuit is proposed.
铺管船用张紧器是海洋铺管船的关键设备，张紧器张紧系统是张紧器保持管线恒张力的保证。
The tensioner is the key device of offshore pipe-laying vessel and the tension system of the tensioner ensures the constant tension.
目的：观察恒切牙外伤冠折后行一次性根管治疗与断冠再接术的临床效果。
Objective To investigate the clinical effect of one-time root canal therapy and reattachment of permanent incisors with crown fracture.
应用推荐