CRAC Class A (2025) — Questions 341–350

U0340. Listening to CW or SSB contacts, we sometimes hear the abbreviation "XYL". Its meaning is:

收听CW或SSB联络，我们有时会听到缩语"XYL"。其含义是：

U0341. There is a class of amateur radio operators honored with the title "YL", and some amateur radio contests have made exclusive rules for these people. The meaning of the abbreviation "YL" is:

有一类业余无线电操作员享有称呼"YL"。而有些业余无线电竞 赛也为这些人士制定了专享的规则。缩语"YL"的含义是：

U0342. The term "element" (单元) usually refers to an antenna element (radiator). Its abbreviation is:

术语"单元"通常指天线振子。其缩语是：

U0343. When discussing antennas in amateur radio contacts, the abbreviation DP stands for:

在业余无线电通联中探讨天线时，缩写DP代表：

U0344. When discussing antennas in amateur radio contacts, the abbreviation GP stands for:

在业余无线电通联中探讨天线时，缩写GP代表：

U0345. When discussing antennas in amateur radio contacts, the abbreviation VER stands for:

在业余无线电通联中探讨天线时，缩写VER代表：

U0346. When discussing antennas in amateur radio contacts, the abbreviation LW stands for:

在业余无线电通联中探讨天线时，缩写LW代表：

U0347. When discussing antennas in amateur radio contacts, the abbreviation YAGI stands for:

在业余无线电通联中探讨天线时，缩写YAGI代表：

U0348. When discussing antennas in amateur radio contacts, the abbreviation BEAM stands for:

在业余无线电通联中探讨天线时，缩写BEAM代表：

U0349. "Class of emission" means a set of characteristics of an emission designated by standard symbols, e.g., the main carrier modulation method, modulating signal, type of information sent, and other applicable signal characteristics. The emission class representing CW telegraphy is:

发射类别（class of emission）是指用标准符号标示的某发射 的一组特性，例如主载波调制方式，调制信号，被发送信息的 类型以及其他适用的信号特性。表示CW报的发射类别是：