奎尼丁对心脏的作用不包括
A．较高溶度升高阈电位
B．缩短心室不应期
C．延长房室结的不应期
D．减慢浦肯野纤维的传导
E．降低异位节律点
参考答案：B
可燃性建筑材料（）
A、木材
B、竹材
C、钢材
D、板条抹灰
The nurse is teaching a group of women to perform breast self-examination. The nurse should explain that the purpose of performing the examination is to discover （）.
A．cancerous lumps.
B．areas of thickness or fullness.
C．changes from previous self-examinations.
D．fibrocystic masses.
