其特征是其结构与普通注射器相似，包括：注射器管、活塞、衬垫、弹簧、手持柄。

The epidural space puncture testing tube is characterized by being similar to the common syringe in structure and comprising a syringe tube, a piston, a gasket, a spring and a hand-held handle.

youdao

其特征是其结构与普通注射器相似，包括：注射器管、活塞、衬垫、弹簧、手持柄。

The epidural space puncture testing tube is characterized by being similar to the common syringe in structure and comprising a syringe tube, a piston, a gasket, a spring and a hand-held handle.

youdao