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1·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.

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。

2·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.

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。

3·On a clear day, a pilot in controlled airspace can choose a VFR or IFR flight plan, and the FAA regulations were devised in a way which accommodates both VFR and IFR operations in the same airspace.

在晴天，在管制空域内的飞行员可以选择目视飞行规则或者仪表飞行规则的飞行计划，而且联邦航空局的条例是以这样一种方式设计的：在同一空域同时适用目视飞行规则和仪表飞行规则的操作。

4·IR analysis showed that IFR was in the form of cycle-type structure.

红外分析表明该阻燃剂具有环状结构。

5·Cellulose diacetate(CDA) is not effective flame-retarded synergistic agent of IFR.

二乙酸纤维素不是IFR有效的阻燃协效剂。

6·The synergism of zeolite in selfmade intumescent flame retardant(IFR) was studied.

考察了分子筛在自制膨胀型阻燃体系（IFR）中的协效催化作用。

7·VFR night flight and IFR flight under visual conditions are also said to be possible.

VFR夜间飞行和IFR目视条件下飞行同样也是许可的。

8·IASC has enacted IAS34 interim financial reporting on 2,1998, it is the fist time that IASC enact standard on IFR.

国际会计准则委员会（IASC）于1 998年2月发布了第34号国际会计准则（IAS）“中期财务报告” ，这是IASC首次就中期财务报告问题发布准则。

9·However, poor compatibility between IFR and polymer matrix leads to some deterioration of mechanical property of materials.

尽管如此，阻燃剂与聚合物间较差的相容性使阻燃聚合物力学性能有所劣化。

10·BusDriver: probably the same time on a holding pattern (or perhaps a bit less). Over the 45 minutes for IFR reserves though.

大概同时进入等待航线（排队）吧（或者稍晚点儿）。高于IFR要求的45分钟时间。