U0828. The encoding amateur radio operators use to mark their own
station location with the Maidenhead grid locator may have 4
or 6 characters. The two differ in positioning accuracy: the
difference is:
A 4-character Maidenhead grid (field+square) spans 2°
longitude × 1° latitude; adding the 2-letter subsquare (6 characters) narrows it to 5′ longitude × 2.5′ latitude (A). The
other options mischaracterize the distinction (administrative, call-sign based, or mode-based).
U0829. To facilitate time calculation, the Earth is divided into several
time zones; the method of dividing each theoretical time zone
is:
为了便于计算时间，将地球划分为若干个时区，各理论时区的
划分方法是：
Exam tips · 考试提示
The theoretical time-zone system divides the Earth into 24 zones of 15° longitude each (360°/24 = 15°), with the prime
meridian (0° longitude) through the center of zone 0 (A). The
12-zone versions (B, D) are wrong, and C misstates the boundaries as 15° multiples rather than centered on the prime
meridian.
U0830. To facilitate time calculation, the Earth is divided into time
zones; the naming rule of each theoretical time zone is:
为了便于计算时间，将地球划分为若干个时区，各理论时区的
命名规则是：
Exam tips · 考试提示
Zone 0 is centered on the prime meridian; moving east gives
East 1–East 12 and moving west gives West 1–West 12 (A). There is no zone 13–24 in the standard scheme (B, C, D are
wrong).
U0831. To facilitate time calculation, the Earth is divided into time
zones; Beijing's situation is:
为了便于计算时间，将地球划分为若干个时区，北京的情况
是：
Exam tips · 考试提示
Beijing is in East 8 (UTC+8), so its local time is 8 hours ahead of
zone 0 (UTC/GMT) time (A). Being east of the prime meridian means earlier (ahead) local time, not later.
U0832. To facilitate time calculation, the Earth is divided into time
zones; the theoretical division is 15 degrees per zone. The
time zones that Beijing, Xi'an and Urumqi actually belong to
are:
Although geographically Urumqi's longitude would suggest East 6, China uses a single legal time zone (Beijing Time,
UTC+8) nationwide, so Beijing, Xi'an, and Urumqi all officially
belong to East 8 (A). The longitude-deduced answers (B, C, D) ignore the legal uniform time zone.
U0833. Given Beijing time, the corresponding UTC time should be:
已知北京时间，相应的UTC时间应为：
Exam tips · 考试提示
Beijing time = UTC+8, so UTC = Beijing time − 8 hours. When
that subtraction yields a negative hour, you add 24 and step back one day (A). Adding 8 (C, D) is the reverse (Beijing-from-
UTC) direction and is wrong here.
U0834. Given UTC time, the corresponding Beijing time should be:
已知UTC时间，相应的北京时间应为：
Exam tips · 考试提示
Beijing time = UTC + 8. So take UTC hours, add 8; if the result
exceeds 24, subtract 24 and advance the date by one day (A). Options B/C/D incorrectly operate on "Beijing time" or move
the date backward.
U0835. Given an amateur station is in a West-N time zone (N an
integer from 0 to 12), its local time should be ___ than Beijing
time:
已知某业余电台处于西N时区（N为0-12间的整数），该台的
当地时间应比北京时间：
Exam tips · 考试提示
Beijing is UTC+8; a West-N zone is UTC−N. The difference
(Beijing − local) = 8 − (−N) = 8+N hours, meaning the local
time is behind (later, 晚) Beijing by 8+N hours (A). East is ahead, west is behind.
U0836. Given an amateur station is in an East-N time zone (N an
integer from 0 to 12), its local time should be ___ than Beijing
time:
已知某业余电台处于东N时区（N为0-12间的整数），该台的
当地时间应比北京时间：
Exam tips · 考试提示
Beijing is UTC+8; an East-N zone is UTC+N. The difference is (Beijing − local) = 8 − N hours. For the typical case N<8 the
local time is behind Beijing ("晚", later) by 8−N hours, which is the form given in the official answer (A). The formula expresses
the standard comparison with Beijing as reference.
U0837. If while participating in an amateur radio CW contest you
copy "B4" or "WKD", it means:
如果在参加业余无线电CW竞赛时抄下"B4"或"WKD"则说明：
Exam tips · 考试提示
In CW contesting, "B4" (before) and "WKD" (worked) are sent
by a station to tell you it has already worked you — a duplicate. The correct response is to check your own log rather than re-
log the contact (A). Re-calling (B), deleting records (C), or treating it as a friendly greeting (D) are wrong.