CRAC Class C (2025) — Questions 321–330
U0317. Sometimes, the DX station we contact still uses "GMT" to express time. The meaning of this time is:
有时，我们通联的DX电台仍使用"GMT"来表示时间。该时间 的含义是：
Exam tips · 考试提示
GMT means Greenwich Mean Time, the universal time reference long used in amateur radio logging and contesting. The other options (GPS zone time, TAI, Loran-C time) are not what GMT stands for.
U0318. The meaning of the amateur-radio abbreviation "GN" is:
业余无线电通信缩语"GN"的意思是：
Exam tips · 考试提示
GN is the abbreviation for "Good Night." Good morning is GM, good luck is GL, and glad is GLD — so A is correct.
U0319. The meaning of the amateur-radio abbreviation "GND" is:
业余无线电通信缩语"GND"的意思是：
Exam tips · 考试提示
GND is the abbreviation for "ground" (the earth connection / grounding). GMT is Greenwich time, GL is good luck, and GLD is glad — so A is correct.
U0320. In late December each year, we often hear the abbreviation "HNY" in CW contacts, which means:
每年的12月下旬，我们常会在CW联络中听到缩语"HNY"，意 思是：
Exam tips · 考试提示
HNY is the abbreviation for "Happy New Year," exchanged around New Year (late December). Happy/felicity is HPY/HPI, hope is HPE, and Merry Christmas is XMAS — so A is correct.
U0321. In a CW contact, we sometimes copy the abbreviation "HPE", which means:
在CW通联中，我们有时会抄到缩语"HPE"，意思是：
Exam tips · 考试提示
HPE is the abbreviation for "hope." Copy/receive is CPY or R (roger), and "here" is HR — so A is correct.
U0322. In a CW contact, we sometimes copy the abbreviation "HPY" or "HPI", which means:
在CW通联中，我们有时会抄到缩语"HPY"或"HPI"，意思是：
Exam tips · 考试提示
HPY / HPI is the abbreviation for "happy." Hope is HPE, copy is CPY, and here is HR — so A is correct.
U0323. The abbreviation for "high-speed telegraphy" is:
"快速收发报"的缩语是：
Exam tips · 考试提示
"快速收发报" (high-speed telegraphy) is abbreviated HST. RTTY is radioteletype, CW is continuous wave / Morse, and RST is the signal-report format — so A is correct.
U0324. When an amateur station finishes its current transmission and listens for any station, it should use the abbreviation:
业余电台完成当前发送并守听任意电台时应使用缩语：
Exam tips · 考试提示
K is the procedural sign inviting any station to transmit ("over to any station"). GA is "go ahead / good afternoon," PSE is "please," and "Come on" is not a standard abbreviation — so A is correct.
U0325. When an amateur station finishes its current transmission and listens only for the other station in the contact, it may use the abbreviation:
业余电台完成当前发送并守听通联中的对方电台时可使用缩 语：
Exam tips · 考试提示
KN is the procedural sign inviting only the addressed station to transmit ("over to you only"). PSE is "please," CU is "see you," and the English sentence is not a standard sign — so A is correct. Note KN is distinct from K (any station).
U0326. To express "thank you very much" in a CW contact, we send:
在CW通联中表达"非常感谢"之意时我们发送：
Exam tips · 考试提示
"MNY TNX" / "MNI TNX" means "many thanks" (thank you very much), the standard CW way to express deep thanks. "VY TNX" alone is just "very thanks" (less standard), and the other options are non-standard phrasings — so A is correct.