CRAC Class A (2025) — Questions 171–180
U0170. The bands below 30 MHz that our country allocates for shared use between the amateur service (and amateur-satellite service) and other services, with the amateur service as one of the primary services, are:
我国分配给业余业务和卫星业余业务与其他业务共用、并且业 余业务和卫星业余业务作为主要业务之一的30MHz以下频段 有：
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Below 30 MHz, the shared bands where amateur is one of the primary services include 1.8 MHz, 3.5 MHz, 14.25 MHz, 18.068 MHz, and 24.89 MHz (A). B wrongly includes 7 MHz (exclusive) and 21 MHz (exclusive); C/D include 10.1 MHz which is a WARC band allocated as a secondary/shared category, not a shared-primary band in this listing.
U0171. In the VHF and UHF range, our country allocates the amateur service (and amateur-satellite service) for shared use with other services under both primary and secondary categories. Which of the following frequencies are allocated for shared use with other services where the amateur service is a primary service:
我国在VHF和UHF范围内分配给业余业务和卫星业余业务与其 他业务共用并设业务类别为主要业务与次要业务，以下那些频 率分配给业余业务和卫星业余业务与其他业务共用并且业余业 务和卫星业余业务作为主要业务：
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In VHF/UHF, 50 MHz and 144 MHz are allocated to amateur as a primary service sharing with others (A). 430 MHz is a secondary service, so any option containing 430 MHz (B, C, D) is wrong.
U0172. The number of bands our country allocates for shared use with other services where the amateur service is the sole primary service, and such a band below 3 GHz, are respectively:
我国分配给业余业务和卫星业余业务与其他业务共用、并且业 余业务和卫星业余业务作为唯一主要业务的频段的个数以及在 3GHz以下的该类频段分别为：
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There are 3 bands where amateur is the sole primary among shared allocations; below 3 GHz one such band is 144–146 MHz (A). 7.0– 7.2 MHz and 50–54 MHz are exclusively amateur, and 28–29.7 MHz is exclusive, so B/C/D are wrong.
U0173. The bands below 1200 MHz that our country allocates for shared use where the amateur service is a secondary service are:
我国分配给业余业务和卫星业余业务与其他业务共用、并且业 余业务和卫星业余业务作为次要业务的1200MHz以下频段有：
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Below 1200 MHz, the secondary amateur allocations include 135.7 kHz, 5351.5 kHz, 10.1 MHz, and 430 MHz (A). 3.5 MHz and 7 MHz are primary/exclusive, 50 MHz and 144 MHz are primary, and 18.068 MHz / 24.89 MHz are shared-primary WARC bands — so B, C, and D are wrong.
U0174. The highest frequency band allocated by our country to the amateur service and amateur-satellite service, and its sharing category, are:
我国分配给业余业务和卫星业余业务的频率最高的频段及其共 用类别是：
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The highest amateur allocation in China is 248–250 GHz, as the sole primary service (A). The other listed bands are lower in frequency, so B/C/D are wrong.
U0175. The international amateur community colloquially calls the three HF bands added to the amateur (and amateur-satellite) service by WARC-76 the "WARC bands"; their frequency ranges are:
国际业余无线电界把WARC-76增加分配给业余业务和卫星业余 业务的三个HF频段俗称为WARC频段，它们的频率范围是：
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The three WARC-76 HF bands are 10.1–10.15 MHz, 18.068–18.168 MHz, and 24.89–24.99 MHz (A). The other options scramble the boundaries or swap digits.
U0176. The so-called 40 m amateur band, its frequency ranges in ITU Regions 1, 2, and 3 and the amateur-service usage status, are respectively:
俗称的40米业余波段，其在ITU1、2、3区的频率范围以及业余 业务和卫星业余业务的使用状态分别为：
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The 40 m band is 7.0–7.2 MHz in Region 1, 7.0–7.3 MHz in Region 2, and 7.0–7.2 MHz in Region 3 (China), and it is an exclusive (专用) amateur allocation (A). Options B/C/D misstate one or more region's edges.
U0177. The frequency range of the so-called 160 m amateur band and the amateur-service usage status are respectively:
俗称的160米业余波段的频率范围以及业余业务和卫星业余业务 的使用状态分别为：
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The 160 m band is 1800–2000 kHz and amateur is a primary service (主要业务) there (A). The other options give wrong edges or wrong service category.
U0178. The frequency range of the so-called 80 m amateur band and the amateur-service usage status are respectively:
俗称的80米业余波段的频率范围以及业余业务和卫星业余业务 的使用状态分别为：
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The 80 m band is 3.5–3.9 MHz and amateur is a primary service (主 要业务) there (A). Other options give wrong service category or wrong upper edge (4.0 MHz is Region 2).
U0179. The frequency range of the so-called 20 m amateur band and the amateur-service usage status are respectively:
俗称的20米业余波段的频率范围以及业余业务和卫星业余业务 的使用状态分别为：
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The 20 m band in China is 14–14.25 MHz exclusive (专用) and 14.25–14.35 MHz primary service (主要业务) (A). The other options misstate the split point or the upper edge.