CRAC Class A (2025) — Questions 21–30
U0020. The international organization that coordinates international radio management is:
协调国际无线电管理的国际组织是：
Exam tips · 考试提示
The international organization coordinating radio management is the 国际电信联盟 (International Telecommunication Union, ITU). IARU is the amateur union, not the regulator; the UN General Assembly and UNESCO are not the radio-coordination body.
U0021. The International Amateur Radio Union (IARU) supports its member societies in viewing the development of amateur radio as a:
国际业余无线电联盟支持会员协会在发展业余无线电时把它看 成一种：
Exam tips · 考试提示
The IARU supports member societies in viewing amateur radio development as a 国家资源 (national resource). The other options (economic stimulus, leisure, defense reserve) are not the IARU's stated framing.
U0022. Which of the following communications does NOT fall within the scope of telecommunication?
下述通信不属于电信（telecommunication）范畴：
Exam tips · 考试提示
电信 (telecommunication) is the transmission of signs, signals, text, images, sounds, etc., by wire, radio, optical, or other electromagnetic means. 邮政通信 (postal communication) is physical mail, not telecommunication.
U0023. Which of the following statements about radio communication is correct?
关于无线电通信的正确说法：
Exam tips · 考试提示
无线电通信 (radio communication) is the transmission, emission, or reception of symbols, signals, text, images, sounds, or other information by radio waves (A). B over-broadens to all EM including light; C wrongly excludes other information types; D misclassifies heating as communication.
U0024. Which of the following statements about terrestrial radio communication is correct?
关于地面无线电通信（terrestrial radio communication）的 正确说法是：
Exam tips · 考试提示
地面无线电通信 (terrestrial radio communication) includes communication between stations on or near the Earth's surface — aeronautical communication is terrestrial (A). Maritime is also terrestrial (B wrong); not all amateur contacts are terrestrial (satellite ones are not, C wrong); skywave/ionospheric communication is still terrestrial (D wrong).
U0025. Radio waves are:
无线电波是指：
Exam tips · 考试提示
无线电波 (radio waves) are electromagnetic waves propagating in space at frequencies below 3,000 GHz (A). B wrongly includes all EM below 3,000 GHz regardless of propagation; C/D use wrong frequency ranges. 业余无线电台的设置与审批 Amateur Station Establishment and Approval
U0026. The materials an individual must submit to the radio management authority to establish and operate an amateur radio station are: (Choose all that apply.)
个人设置、使用业余无线电台应当向无线电管理机构提交的材 料为：
Exam tips · 考试提示
An individual applying to establish/operate a station submits: an application form (A); identity document copies, plus guardian documents if a minor (B); and equipment descriptive materials (C). D (self-written letter + operator certificate copies) is not a required submission material.
U0027. The materials an organization must submit to the radio management authority to establish and operate an amateur radio station are: (Choose all that apply.)
单位设置、使用业余无线电台应当向无线电管理机构提交的材 料为：
Exam tips · 考试提示
An organization applying submits: an application form (A); equipment descriptive materials (B); and a business-license copy plus proof the technical lead is its staff (C). D (a letter by the technical lead + certificate copies) is not the required material.
U0028. When establishing and operating an amateur radio station, which of the following conditions comply with the regulations? (Choose all that apply.)
设置、使用业余无线电台，下列哪些条件符合规定：
Exam tips · 考试提示
Compliant equipment conditions include: type-approved equipment (A); the type-approval certificate covering amateur bands (B); and self-made/modified/assembled equipment that meets national standards (C) and whose transmit range is limited to amateur bands (D). All four are expressly permitted.
U0029. Where a person intends to establish and operate an amateur radio station using self-made, modified, or assembled radio transmitting equipment that has not obtained type approval, when the radio management authority conducts technical testing of the equipment:
设置、使用业余无线电台拟使用自制、改装、拼装等未取得型 号核准的无线电发射设备的，无线电管理机构开展对该设备进 行技术检测时：
Exam tips · 考试提示
When the authority tests self-made/modified/assembled equipment lacking type approval, it 不得收取任何费用 (may not charge any fee). The other options (charging fees) are prohibited.