当阀门的保护方式为失气关闭时，必须选择单作用的反作用气缸。
When the valve of protection for the loss of gas is turned off, you must select a single role of the reaction cylinder.
该船的主机为单作用，二冲程，带涡轮增压器的十字头柴油发动机，并且螺旋桨为定距桨。
The vessel to be propelled by a single-acting two stroke supercharged cross head Diesel engine, acting to a fixed pitch propeller .
改进后的挡轮液压缸还可为其它低速运行的单作用液压缸地研制提供借鉴作用。
This new hydraulic cylinder may also provide reference for other single-acting cylinders with low speed.
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