单向作用汽缸single-acting cylinder【机】
单动式空气压缩机single-acting air compressor
单动打桩机single-acting pile hammer
单动发动机single-acting engine
双级单作用压缩机two-stage single-acting compressor
单作用压缩机single-acting compressor
单作用功率单元single-acting power unit【计】
单动式起绒机single-acting raising machine