下述哪项不属于周围血管征（ ）
A 水冲脉
B 枪击音
C 毛细血管搏动征
D 肝-颈静脉回流征
E 杜氏双重杂音

单项选择题付费排名主要是企业在搜索引擎购买关键词，当用户搜索这些关键词信息时，企业的推广内容就会出现在用户面前。( ) A、正确 B、错误

单项选择题Which of the following statements about Poe’s writing principles is incorrect? A、The most important purpose of poetry is the creation of beauty. B、A poem should be written for its own sake. C、The best tone of a poem is sadness. D、Only a long poem can sustain the level of emotion on the reader.