Those units provide a means of preventing it from freezing.
答案解析
解析：
A. 这些单位意味着它们可以防止它腐蚀。这个选项与题干提到的防止冰冻的功能不符，因此不是正确答案。
B. 这些单位提供了除冰的方法。这个选项提到了除冰，但题干中并没有提到除冰，而是防止冰冻。所以这个选项也不是正确答案。
C. 这些单位提供了一种防止冰的形成的方法。这个选项与题干中提到的防止冰冻的功能相符，因此是正确答案。
所以，答案是C。
为了更好地理解这个知识点，我们可以通过生动的例子来帮助记忆。比如，想象一下在寒冷的冬天，你的汽车挡风玻璃上结了一层厚厚的冰，而你使用的是一种特殊的喷雾剂，它可以防止冰的形成，让你的挡风玻璃保持清晰。这种喷雾剂就好比题干中提到的那些单位，它们提供了一种防止冰冻的方法。
相关知识点：
装置防结冰
相关题目
A weight and balance loading form and an explanation of the calculation procedure shall be provided.
This paragraph describes the procedures to calculate weight and moment for various phases of a planned flight and to ensure that the center of gravity is within approved limits.
Explain how to maintain this record when changes to the weight or moments of the airplane are made so that accurate starting data is available to calculate the weight and C.G. during normal operation of the airplane.
INSPECTION PROCEDURE sets forth the inspection procedure(s) to be utilized, such as magnetic particle, visual, etc, and may reference another document for the actual procedure, such as a nondestructive testing manual.
A review of test results applicable to the design was made. The loading conditions together with the resulting margins of safety were evaluated. The resulting data were used to determine if the component should be considered for incorporation into the CAP.
The effects of corrosion have not been considered in the rationale in selecting inspection times or in the effects on the fatigue stresses. It is very difficult to determine the effects of corrosion but, as the reports from the CAP inspections are received, the inspection times will be adjusted for any severe problems.
High-time airplanes, disassembled for major overhaul, were inspected to assist in selecting inspection items. Other high-time airplanes’ special Continuing Airworthiness Program Inspection results supplement these inspections.
In addition to understanding FAA Advisory Circulars AC 91-60 and AC 91-56, familiarity with GAMA Specification No.2, Manufacturers Maintenance Data and Air Transport Association of America Specification No.100, Specification for Manufacturers Technical Data, will aid in the preparation of a CAP for a specific airplane.
The Continuing Airworthiness Program Inspection Document (CAP) is inspection data that, when combined with the operator’s existing maintenance program, will help maintain the structural integrity and continued airworthiness of the ABC XXX Series airplanes.
REPAIR/MODIFICATION sets forth repair or modification instructions and may refer to a standard repair in another document or a special repair or modification defined elsewhere, such as in a service kit, service bulletin, etc.
