【简答题】低钾血症对心肌的兴奋性有何影响?简述其机制。
【单选题】I was ___________ leave. suddenly, it rained.
【单选题】I was ___________ leave. Suddenly, it rained.
【单选题】It suddenly rained and we had to it in a doorway. [ ]
【简答题】London's weather is very strange. It can rain several times a day; each time the rain may come suddenly after the sun is shining brightly. The air is damp and chill right through July. On o...
【单选题】-Why are you all wet? -It rained ________ and I didn't take my umbrella.
【单选题】心肌的兴奋性是指
A.
细胞在没有外来刺激的情况下,自动地产生节律性兴奋的特性
C.
在一次期前收缩之后往往有一段较长的心室舒张期
【单选题】It rained _____ all summer, which completely spoiled our vacation.
【单选题】心肌的兴奋性是指:( )
A.
细胞在没有外来刺激的情况下,自动产生节律性兴奋的特性
C.
在一次期前收缩之后往往有一段较长的心室舒张期