【判断题】光学显微镜的光学系统由物镜、目镜、聚光器等组成,直接影响着显微镜的性能,是显微镜的核心。
【单选题】心电图上表示冲动从心房传导到心室的时间是
【单选题】病人,男性,35岁。心电图上显示为QRS波群提前出现,形态宽大畸形,其前无相应的P波,其后有完全性代偿间歇。此心电图表现为
【单选题】It was raining. She went out.
A.
Even though itt was raining, She went out
B.
It was raining, even if she went out.