重量与机身长度 Weight and body length
重量和长度影响搬运、操作空间与作业节奏，但不能单独决定适用性。比较时应把现场空间、钻孔方向与气腿配置一起考虑。 Weight and length affect handling, working space and work cycle, but do not alone establish suitability. Consider space, direction and air-leg configuration together.
孔径、耗气量与冲击频率 Diameter, air consumption and impact frequency
参考孔径用于建立候选范围；耗气量需要与空压机和管路条件核对；冲击频率是参考指标之一，不应脱离岩性、孔深和整套配置单独判断。 Diameter defines an initial range; air consumption must match compressor and hose conditions. Impact frequency is one reference value, not a standalone assessment independent of rock, depth and configuration.