CRAC Class C (2025) — Questions 201–210

A distress (遇险) station requesting break-in has absolute priority. The correct first action is to make contact with it immediately and ascertain its needs (A). While B (routing to emergency comms volunteers) is also good practice, the answer key marks A as the direct, correct response; C/D (leave the frequency or stop transmitting) would abandon the distressed station.

Courtesy when breaking in means considering whether your entry would disrupt the original pair's exchange (A). The other options focus on signal quality, license class, or "more interesting content" — none are the proper etiquette criterion.

For a minor, non-harmful operating lapse, the constructive approach is friendly off-air advice (phone/email) rather than public confrontation or formal complaints. Option A is correct; B (on-air scolding), C (immediate authority report), and D (association "policing") are disproportionate.

When seriously interfered with by an illegal/unknown station, the proper response is to gather evidence (time, frequency, recording) and report to the radio management authority; do not engage or retaliate. Option A is correct. B (on-air arguing) and D (jamming with high power) are themselves violations; C is partially right but A's "collect info first, then report" is the marked answer.

For lengthy, important two-way discussion (technical + personal), ordinary telecommunications (telephone/internet) are appropriate and not "radio communication" subject to amateur rules. Option A is correct. Amateur radio is for the radio contact itself, not as a substitute for routine long conversations; B/C/D are radio methods less suited to a long detailed exchange.

The required log (电台日志) essentials are: date/time, frequency, mode, the correspondent's call sign, and signal reports (RST/RS). Option A matches. Names, equipment, QTH, and weather are not mandatory log fields.

QSL cards serve many purposes: confirming contacts (本地/国 内/全球) (A), recording station/equipment performance including homebrew (B), supporting award (奖状) applications (C), and the hobby of collecting/displaying cards (D). All four are valid meanings of QSL exchange.

A valid QSL card must carry: both call signs (A), signal reports and time (B), mode and frequency (C), and the operator's signature/stamp plus the station's return address (D). All four are minimum required contents so the card can serve as proof of contact.

A QSL used for a non-contact purpose (e.g., a face-to-face "Eyeball QSO") must state that in the mode field, and blank cards should not be handed out. Option A is correct. B (giving blank cards as photos/name cards) and D (filling a wrong/absent call with a name) defeat the card's purpose; C (confirming a contact that never happened) is fraudulent.

An overseas QSL with IRCs (国际回信券) is a direct request for a return card. The correct step is to verify the contact in your log, then return your QSL directly to the sender's address (using the IRC for postage). Option A is correct; B skips verification, C routes via the bureau (not "direct" as requested by IRCs), and D is dismissive and wrong.