生理情况下影响收缩压的主要因素是（）
A.心率的变化
B.搏出量的变化
C.循环血量的变化
D.外同阻力的变化
E.大动脉管壁弹性的变化
参考答案：B
阅读短文，回答问题。
Mum: What are you doing, Amy?
Amy: I'm writing a letter to my friend, Kitty.
Mum: But how can you? You are only four years old. You don't know how to write.
Amy: Well. It doesn't matter. Because Kitty doesn't know how to read.
1. How old is Amy?
2. What is Amy doing?
3. Can Amy write?
4. Who is Kitty?
5. Can Kitty read?
eTOM模型的核心是( )。
A．战略、基础设施流程域B．企业管理流程域C．运营流程域D．产品流程域
