第2题: [单项选择]关于MRI射频线圈对SNR的影响,不正确的是() A. 射频线圈的类型影响着SNR B. 线圈的形状、大小对SNR有影响 C. 体线圈包含的组织体积大,SNR也高 D. 表面线圈能最大限度地接收MR信号 E. 检查部位与线圈的距离对SNR有影响 参考答案:C 答案解析:体线圈包含的组织体积大,产生的噪声量也大,因此SNR低。
第30题: [单项选择]Water has become "cool" in the Minneapolis school district partly because ______. A. water is provided free B. most kids can afford nothing but water C. water machines are put in noticeable positions D. children have realized the harm of sugary drinks 参考答案:C 答案解析:[解析] 从第二段的对话“‘We located the water machines strategically outside our buildings, so when you come ou
第31题: [单项选择]分离培养真菌常用() A. 亚碲酸钾培养基 B. 鸡胚卵黄囊 C. 沙氏培养基 D. 罗氏培养基 E. 柯氏培养基 参考答案:C