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- In order to improve the reliability of servo system, a triplex electro-hydraulic servo actuator system with three torque motors, three jet flapper valves and three sets of feedback components is designed. 摘要为了提高伺服作动系统的可靠性，设计了一种三余度的电液伺服作动系统，将伺服阀的力矩马达、喷嘴挡板阀、系统的反馈元件等做成一式三份。
- An aircraft powered by two jet engines. 双喷气发动机的飞机
- GD high vacuum flapper valve is used to put through or cut off the airflow in vacuum pipeline. GD型高真空挡板阀用于接通或切断真空管路中的气流。
- According to its shaft seal structure, high vacuum flapper valve is classified into GD-J rubber shaft seal type and GD-J(b)bellows shaft seal type. 高真空挡板阀按轴封结构可分GD-J型橡胶轴封和GD-J(b)型波纹管轴封两种。
- GDHigh Vacuum Flapper Valve GD high vacuum flapper valve is used to put through or cut off the airflow in vacuum pipeline. GD型-高真空挡板阀 GD型高真空挡板阀用于接通或切断真空管路中的气流。
- The rotary experiment design was adopt to obtain the relation between two jet orifices position and yarn strength.On the base of mathematical model,the parameters were optimized. 利用通用旋转组合设计的方法研究了喷气纺纱机上两个喷嘴喷射孔的位置与喷气纱强力的关系,建立了优化数学模型,并给出了优化后的参数。
- Electro High Vacuum Flapper Valve GDC-JQelectro high vacuum butterfly valve uses electromagnetic force to directly drive valve disc working. thus to make valve opened ro closed. GDC-J型电磁高真空挡板阀是以电磁力为动力直接带动阀板动作，使阀门开启或关闭。
- The equalizing port assembly features a structural support member in the form of a retainer key (80) that is secured to the flapper valve member both axially and radially. 补偿口组件特征在于保持器键(80)形式的结构支撑元件，保持器键(80)在轴向和径向上都固定到挡板阀元件上。
- GDQ pneumatic high vacuum flapper valve uses solenoid directional valve to change the direction of air passage,controls the actuating cylinder to drive the valve openedclosed. GDQ型气动高真空挡板阀是通过电磁换向阀改变气路方向，控制执行气缸驱动阀门作启闭运动。
- GDC-5 electro high vacuum flapper valve is mounted in vacuum pipeline to put through or cut off the airflow in vacuum system, or used as a charging vale. 简单介绍： GDC-5型电磁高真空挡板阀是连接在真空管路上，用来接通或截止真空系统中的气流，或作充气阀用。
- A flapper valve assembly is described having an equalizing port assembly (32) with a bleed valve member (64) that is moveable between an open position and a closed position. 本发明公开了一种挡板阀组件，挡板阀组件具有补偿口组件(32)，补偿口组件(32)带有可在打开位置与关闭位置之间移动的排放阀元件(64)。
- Electro High Vacuum Flapper Valve GDC-5 electro high vacuum flapper valve is mounted in vacuum pipeline to put through or cut off the airflow in vacuum system, or used as a charging vale. GDC-5型电磁高真空挡板阀是连接在真空管路上，用来接通或截止真空系统中的气流，或作充气阀用。
- a plane propelled by two jet engines. 用两个发动器推动的飞机。
- GDQ pneumatic high vacuum flapper valve uses solenoid directional valve to change the direction of air passage, and controls the actuating cylinder to drive the valve opened and closed. GDQ型气动高真空挡板阀是通过电磁换向阀改变气路方向，控制执行气缸驱动阀门作启闭运动。
- GDC-5Electro High Vacuum Flapper Valve GDC-5 electro high vacuum flapper valve is mounted in vacuum pipeline to put through or cut off the airflow in vacuum system, or used as a charging vale. GDC-5型-电磁高真空挡板阀 GDC-5型电磁高真空挡板阀是连接在真空管路上，用来接通或截止真空系统中的气流，或作充气阀用。
- The explosion triggers two jets, whose particles travel no less than 99.9999 percent the speed of light. 爆发造成了两股喷流，喷流中的粒子以不低于99.;9999%25光速的速度传播。
- GDC-] Electro High Vacuum Flapper Valve GDC-JQelectro high vacuum butterfly valve uses electromagnetic force to directly drive valve disc working. thus to make valve opened ro closed. GDC-J电磁高真空挡板阀 GDC-J型电磁高真空挡板阀是以电磁力为动力直接带动阀板动作，使阀门开启或关闭。
- The two systems of government are polar opposites. 这两种政体正好相反。
- The business is owned by two partners. 这家商行为两名合伙人所拥有。
