晶体管可在一个密封和非密封包装，包括多种配置的平衡。
Transistors are available in a variety of hermetic and non-hermetic packages including balanced configurations.
XM31A型机械密封为单端面、多弹簧非平衡型结构。采用传动螺钉传动。
Mechanical seal type XM31A has a single seal face and multi-spring unbalanced structure, and is driven by screw transmission.
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