求翻译： 掌握了常用电工工具的使用，学习并连接了常用控制电路；掌握了电路及其元件焊接及组装技术，并独立完成了收音机的焊接组装是什么意思？

 mastered the use of common electrical tools, learn and connect the common control circuit; mastered the circuit and its components, welding and assembly technology, and independently completed the welding assembly of the radio

*  mastery of the commonly used electrical tools, and to learn from and use the commonly used control circuit connecting the circuit and its components; grasp welding and assembling the radio technology and independent completion of welding assembled

 Has grasped the commonly used electrician tool use, studied and has connected the commonly used control circuit; Has grasped the electric circuit and the part welding and the assembly technology, and has completed the radio welding assembly independently

Mastered the use of common electrical tools, learning and connecting common control circuits; mastered the circuit and the elements welding and Assembly technology, and welding Assembly of independent radio

Got popular electric tools for use learning and connecting common control circuits; mastered the welding circuit and component and Assembly technology and welding Assembly of independent radio