CRAC Class A (2025) — Questions 301–310
U0300. If you need the other party to repeat the previous operation, such as re-sending the call sign or the signal report, you may use the abbreviation:
如需对方重复上次的操作，比如重报呼号或信号报告，我们可 使用缩语：
Exam tips · 考试提示
AGN is the abbreviation for "again" — used to ask for a repeat (of the call sign, signal report, etc.). AGC is the electronics term "automatic gain control," ABT means "about," and ABV means "above" — none means repeat.
U0301. The meaning of the amateur-radio abbreviation "AHR" is:
业余无线电通信缩语"AHR"的意思是：
Exam tips · 考试提示
AHR is the CW abbreviation meaning "another" (or "other"). Antenna is abbreviated ANT, "here" is HR, and address is ADR/ADDR — so only A is correct.
U0302. The abbreviation for "amateur radio direction finding" is:
"业余无线电测向"的缩语是：
Exam tips · 考试提示
"业余无线电测向" (amateur radio direction finding) is abbreviated ARDF (per the glossary: 无线电测向运动 = radio direction-finding sport / ARDF). ATU is an antenna tuning unit, ADDR is address, and ANT is antenna — none is direction finding.
U0303. When exchanging QSL information during a CW contact, we may use the term "post office box." Its abbreviation is:
在CW联络中交换QSL信息时，我们可能用到"邮政信箱"这个术 语。其缩语是：
Exam tips · 考试提示
A post office box is abbreviated "BOX" or "P O BOX" in CW traffic. "BOX OF MAIL" is not a standard abbreviation, BURO means QSL card bureau (manager), and QTH means location — none is the post-office-box term.
U0304. The abbreviation for "QSL card bureau (manager)" is:
"QSL卡片管理局"的缩语是：
Exam tips · 考试提示
"QSL卡片管理局" (QSL card bureau / manager) is abbreviated BURO. BOX is a post office box, while ROUTER and SWITCH are networking terms unrelated to QSL handling.
U0305. In a CW contact, we sometimes copy the abbreviation "CK", which means:
在CW通联中，我们有时会抄到缩语"CK"，意思是：
Exam tips · 考试提示
CK is the CW abbreviation for "check" (as in "PSE CK" = please check). Clock is abbreviated CLK, and congratulations is usually CONGRAT or GLD/GB — so A is correct.
U0306. The abbreviation an amateur station uses when making a general call is:
业余电台发起呼叫时会使用缩语：
Exam tips · 考试提示
CQ is the universal general call meaning "calling any station." CU AGN means "see you again," TU means "thank you," and the English sentence is not a standard abbreviation — so A is correct.
U0307. When describing a signal coming from a distant place, amateurs often use the abbreviation:
形容某个信号来自远地时，爱好者们经常使用缩语：
Exam tips · 考试提示
DX is the abbreviation for a distant station or long-distance contact. DE means "from" (used before your call sign), DR is "dear," and DSW is not a standard ham abbreviation — so A is correct.
U0308. In a CW contact, we sometimes copy the abbreviation "ES", which means:
在CW通联中，我们有时会抄到缩语"ES"，意思是：
Exam tips · 考试提示
ES is the CW abbreviation for "and." "From" is DE, "is/are" is often omitted or written as "IS," and "please wait" is WAIT or PSE WAIT — so A is correct.
U0309. In a CW contact, we sometimes copy the abbreviation "FB", which means:
在CW通联中，我们有时会抄到缩语"FB"，意思是：
Exam tips · 考试提示
FB stands for "Fine Business," meaning excellent or first-rate (often used for a strong signal or good operator). The other options are not the meaning of FB.