它们可以有直的、弯的或偏置的刀杆。
偏置球系统最有积极性，通过将球压到一个倾斜的顶杆，在顶针和客体之间提供极其一致的连接。
The bias-ball system is the most aggressive, providing a highly consistent connection between the plunger and barrel by compressing a ball against an angled plunger.
偏置顶针和偏置弹簧系统的积极性较低，因而在顶杆和套筒之间提供一致性较低但仍可接受的连接。
Bias-plunger and bias-spring systems are less aggressive, and subsequently deliver a less consistent, yet still acceptable, connection between plunger and barrel.
偏置顶针和偏置弹簧系统的积极性较低，因而在顶杆和套筒之间提供一致性较低但仍可接受的连接。
Bias-plunger and bias-spring systems are less aggressive, and subsequently deliver a less consistent, yet still acceptable, connection between plunger and barrel.
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