Duo to the drawbacks of the difficulty, unsafety, low efficiency and laboriousness in assembling and disassembling a certain gun family magazine drum coil spring.

  • 摘要针对某型枪族弹鼓涡簧的装卸操作难度大、安全系数小、劳动强度高和工作效率低等雈难题。
目录 查词历史