主轴的进能量和转速是通过选速杆使主轴箱中的适当齿轮相啮合而控制的。
Spindle feeds and speeds are controlled by selector levers which engage the proper gears in the drill head.
模拟计算了各种工况下的发动机性能：怠速工况降低了残余废气系数，提高了进气流速，稳定性得到改善；
We simulate engine performance in various operating conditions:in idle condition, it reduces the residual gas coefficient and increases airflow velocity, so that idle stability is improved.
2003年，马瑞利汽车零部件（芜湖）有限公司在安徽芜湖成立，其主要产品为塑料进气歧管、喷油嘴、选速器和车灯等高新技术产品。
Magneti Marelli Automotive Components (Wuhu) Co. , Ltd. setting up in 2003, main products include Plastic fuel manifold, Intake manifold, Throttle bodies, Autolamp such high-tech products.
分布板外环区单独进气时，随气速增加，流化床内负静电势区域逐渐扩大。
Fouthly, a primitive model to describe the electrostatic potential distribution in the fluidized bed is established based the previous research.
分布板外环区单独进气时，随气速增加，流化床内负静电势区域逐渐扩大。
Fouthly, a primitive model to describe the electrostatic potential distribution in the fluidized bed is established based the previous research.
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