问题
单项选择题
快速心律失常中最常见的发生机制是()
A.儿茶酚胺释放过多
B.折返机制
C.房室旁路
D.心肌细胞内外阳离子的不平衡
E.心肌细胞自律性增高
答案
参考答案:B
快速心律失常中最常见的发生机制是()
A.儿茶酚胺释放过多
B.折返机制
C.房室旁路
D.心肌细胞内外阳离子的不平衡
E.心肌细胞自律性增高
参考答案:B
综合填空。(10分) 根据短文内容,从方框中选择适当的单词,使短文完整、通顺,不要求改变词型。
As we know, food gives us 1 . We must have 2 food to keep us 3 . Of course, we must also have the right 4 of food. We should eat more 5 and vegetables but 6 meat. Different foods help us in different 7 . If we eat too 8 or too much food, or if we 9 the wrong food, it can make us 10 . |