题目内容

心率过快时新输出量减少的原因是()

A. 心房收缩期缩短
B. 等容收缩期缩短
C. 心室射血期缩短
D. 等容舒张期缩短
E. 心室充盈期缩短

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正常人心率超过180次/分时,引起心输出量减少的原因是()

A. 等容收缩期缩短
B. 快速射血期缩短
C. 减慢射血期缩短
D. 等容舒张期缩短
E. 心室充盈期缩短

When you meet someone, you could say:

A. Pleased to meet you.
B. How are you?
C. It was nice meeting you.

以下数据结构中,( )是非线性数据结构。

A. 树
B. 字符串
C. 对
D. 栈

在下面的程序段中,对x的赋值语句的频度为( )。FOR i:=1 TO n DOFOR j:=1 TO n DOx:=x+1;

A. O(2n)
B. O(n)
C. O(n2)
D. O(log2n)

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