问题
单项选择题
在心动周期中,占时间最长的是
A.心房收缩期
B.等容收缩期
C.等容舒张期
D.充盈期
E.射血期
答案
参考答案:D
在心动周期中,占时间最长的是
A.心房收缩期
B.等容收缩期
C.等容舒张期
D.充盈期
E.射血期
参考答案:D
补全对话。 | |
B: Yes, I am. 1______ A: I'm traveling here, too. When did you arrive? B: 2______ A: I've just arrived. 3______ B: Yes. I enjoyed it very much. A: How long will you stay here? B: 4______ Then I'll go to France and England. A: Oh, that's great! I'll go there, too. Can I go with you? B: Of course. 5______ |