对选择仪器感到没有头绪的时刻，有关这些特性的评论为挑选恰当的设备提供了极宝贵的帮助。
Review of this nature can be invaluable as aid to the selection of the correct equipment when the choice seems infinite.
对一些不便应用“误差均分”原则选择仪器的实验，提出应用“误差影响分析”的方法选择仪器。
The Error Effect Analysis is applied for the experiments to which the Average Difference Division Principle is not applicable while choosing instrument.
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.
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