字母缩略语可分为纯字母型和字母参与型两种类型。
Grouped into the pure-letter type and the type with letter combinations, they have peculiar features of formation and rules.
它还提供了诸如定义，缩略语，螺杆扭矩值，以及连接的多种类型等扭矩信息。
It also provides valuable torque information such as: definitions, abbreviations, screw torque values, and types of joints and more.
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