CRAC Class C (2025) — Questions 281–290
U0277. During a contact, if you wish to ask the other party to join in some amateur radio activity (e.g., "Mulan Weichang — Worked All Provinces of China"), you may use the phrase:
通联时，如希望相约对方参加某个业余无线电活动（如，"木兰 围场-通联中国之省"），可使用短句：
Exam tips · 考试提示
QRV means "Are you ready? / I am ready (to receive or to operate)." The phrasing "QRV IN WAPC?" asks whether the other station is ready to participate in the WAPC (Worked All Provinces of China) activity. QSY means change frequency, QSO means a contact, and QRT means stop transmitting — none invite someone to join an activity.
U0278. The meaning of the Q-code "QRV" is:
Q简语"QRV"的含义是：
Exam tips · 考试提示
QRV means "Are you ready? / I am ready (to receive transmission or to operate)." Option A captures this. B is QRL (busy), C is closer to QRU (I have a message), and D is QRP (reduce power) — none is QRV.
U0279. When making a call, if you did not hear the other station's call sign clearly, you may use the following phrase to ask them to repeat it:
进行呼叫时，如果没有听清对方呼号，可使用如下短句请求对 方重发：
Exam tips · 考试提示
QRZ? means "Who is calling me? / Who is calling?" When you hear a call but cannot copy the call sign, QRZ? is the standard request for the station to identify again. QRU? asks about messages, QSY? is about changing frequency, and QSA? asks about signal strength — none requests a repeat of the call sign.
U0280. The meaning of the Q-code "QRZ" is:
Q简语"QRZ"的含义为：
Exam tips · 考试提示
QRZ as a statement names the calling station ("the station calling you is ..."); as a question it means "Who is calling me?" Option A is exact. B is QRV, C is QRL, and D is QRP — all different codes.
U0281. Reading early Chinese amateur radio literature, we may encounter a signal report expressed with a Q-code and five strength levels. That Q-code is:
阅读我国早期业余无线电文献，我们可能发现一种用Q简语和5 个强度等级来表示的信号报告。该Q简语是：
Exam tips · 考试提示
QSA is the Q-code for signal strength, graded on a 1–5 scale ("What is the strength of my signals? / Your signals are strength ..."). This is the historical five-level signal report. QSB is fading, QSD is keying defect, and QSK is break-in — none is a strength report.
U0282. During a contact, if you want to find out whether your signal is fading, you may use the phrase:
通联时，如需了解自己的信号是否衰落，可使用短句：
Exam tips · 考试提示
QSB? means "Is my signal fading? / Are my signals subject to fading?" Asking whether your own signal is weakening is exactly QSB?. QSD? is about keying defects, QRB? is about distance, and QSP? is about relaying — none asks about fading.
U0283. The meaning of the Q-code "QSB" is:
Q简语"QSB"的含义为：
Exam tips · 考试提示
QSB means "Your signals are fading / subject to fading." Option A is correct. B is QSD (keying defect), C is QRJ/QR? (repeat), and D is QSK (break-in).
U0284. Xiaoqiang and Xiaoming are practicing CW. If Xiaoqiang asks "Do I have a fault in my sending technique?", he can send:
小强和小明练习CW。若小强问"我发报的手法有毛病吗？"，他 可以发：
Exam tips · 考试提示
QSD? means "Do you have a keying defect? / Is my keying bad?" Asking whether one's sending technique (手法) is faulty is exactly QSD?. QSB? is fading, QSV? is "shall I send a series of V's", and QRM? is about interference — none asks about sending quality.
U0285. Xiaoqiang and Xiaoming are practicing CW. Xiaoming thinks Xiaoqiang's technique was poor when sending the letter "Y". He can key:
小强与小明练习CW。小明认为小强刚才发字母"Y"时手法不 好。他可以拍发：
Exam tips · 考试提示
QSD means a keying/sending defect. "QSD AT Y" pinpoints that the defect occurred at the letter Y. QRH concerns frequency drift, QSU concerns the frequency to which a station should send, and QSS concerns the frequency in use — none flags a sending-technique fault.
U0286. Xiaoqiang and Xiaoming are practicing CW. Xiaoming thinks Xiaoqiang's sending has a thumping key-click sound. He can key:
小强与小明练习CW。小明认为小强发报时有砰然的键击声。他 可以拍发：
Exam tips · 考试提示
A thumping key-click is a keying (sending) defect, which is described by QSD. "QSD PSE CK" therefore asks the sender to check their keying. QRI concerns tone quality (and is not the answer key here), QRH concerns frequency drift, and TVI (television interference) is a different problem unrelated to the sending defect described.