我国发生的严重急性呼吸综合征(sARS),很快波及到许多省市,这种发病情况称为()。
A.暴发
B.流行
C.季节性升高
D.周期性流行
E.长期变异
参考答案:A
核素成像,静态图像分析的要点是()
A.脏器位置
B.脏器形态
C.动态变化
D.放射性分布
E.脏器大小
根据首字母或汉语提示写出单词。
1. The man noticed two policemen coming t______ him.
2. There are several d______ for New York every day.
3. This is the first s______ for you to succeed.
4. She ______ (点头) to us as she walked by.
5. Horses were the only means of ______(交通方式).