社区构成的要素之一为() ["工厂","有一定的生活服务","居民之间不发生种种社会关系","各种社会群体和机构无关","聚居的一群人"]
"常规SE序列质子加权"的扫描参数为以下哪项() ["TR≥60ms,TE≤1500ms","TR≥600ms,TE≤2000ms","TR≥80ms,TE≥2000ms","TR≥2000ms,TE≤50ms","TR≤100ms,TE≤1500ms"]
女性,40岁,中度弥漫性甲状腺肿伴甲亢合并迁延性肝炎,且对抗甲状腺药物过敏,首选何种治疗() ["硫脲类制剂","碘制剂","普萘洛尔","131I","手术"]
金属物品带入磁体孔腔内会导致() ["磁场强度改变","磁场均匀度破坏","对射频产生影响","图像对比度下降","磁场稳定度下降"]
铁磁性颗粒造影剂对质子弛豫时间的影响为() ["T1缩短,T2缩短","T1缩短,T2延长","T1不变,T2缩短","T2不变,T2延长","T1延长,T2缩短"]
简述支架式学习模式。