E级和A 级空域的区别在于，在 A 级空域，所有操作都需遵照仪表飞行规则，飞行员必须要有仪表等级，也就是说，要有操作航空仪表方面的技术和执照。
The difference between Class E and A airspace is that in Class A, all operations are IFR, and pilots must be instrument-rated, that is, skilled and licensed in aircraft instrumentation.
对于想要成为一名飞机教官的学员而言，飞行教官仪表等级是非常重要的。
The flight instructor Instrument rating is also important to students interested in preparing for employment as a flight instructor.
仪表等级赋予飞行员控制飞机的能力，而不用参考地面或地平线，只使用飞行和导航仪表。
The Instrument Rating gives the ability to control the aircraft without reference to the ground or horizon, using flight and navigation instruments.
CFII仪表等级，合并到合格飞行教官证书以后，允许学员们教授仪表程序，和积累有价值的仪表飞行经验。
The CFII instrument rating, when added to the Certified flight Instructor certificate, allows the student to teach instrument procedures, and accumulate valuable instrument flight experience.
然而，如果飞行员持有的仪器等级在其必须持有的基本的飞行员执照等级之上，那么飞行员只能选择仪表飞行规则。
However, a pilot can only choose to fly IFR if they possess an instrument rating which is above and beyond the basic pilot's license that must also be held.
夜间目测及信号导航等级则要求仅用仪表装置来证明你导航的能力。
Night VFR and command instrument ratings (CIR) require you to prove your ability to navigate by instruments only.
介绍了石化行业安全仪表系统及其安全完整性等级确定方法，并对方法的应用范围进行了说明。
This paper introduces the safety instrument system and method of its safety level integrity of petrochemical industry, and discusses application scope of this method.
介绍了设计过程中的安全仪表系统等级确定的基本方法及实施验证的主要过程和方法。
Basic method for determining the grades of safety instrumented system in design as well as the main process and methods for implementation and verification are introduced as well.
必须满足技术规格书对仪表防爆及防护等级的要求，并提供相应的质量证明文件。
Explosion proof and protection class for instrument shall be met according to the requirements of Technical Specification, and relevant quality certificate documents shall be provided.
所有现场安装的气动仪表和控制阀防护等级一般不低于IP65。
Enclosure proof class for all the field mounted electronic instruments shall not be less than IP65.
文中介绍了应用该仪表系统测量火花等级来诊断电机故障的例子。
As an example, it is recommended to diagnose the fault of motor by measuring the rank of spark with this system.
所有现场安装的气动仪表和控制阀防护等级一般不低于IP65。
Enclosure proof class for all the field mounted pneumatic instruments and control valves shall not be less than IP65.
本文根据国际标准IEC- 61508的指导意见，通过几种常用方法的比较，确定了利用系统模型的定量风险来确定所需安全仪表系统完整性等级。
On the basis of IEC-61508 directive suggestion, this thesis compares several general methods and comes into a result: assignment of SIL by system model's risk.
本文根据国际标准IEC- 61508的指导意见，通过几种常用方法的比较，确定了利用系统模型的定量风险来确定所需安全仪表系统完整性等级。
On the basis of IEC-61508 directive suggestion, this thesis compares several general methods and comes into a result: assignment of SIL by system model's risk.
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