问题
单项选择题
外周阻力和心率不变而搏出量增大时，动脉血压的变化主要是（）
A.收缩压升高
B.舒张压升高
C.收缩压和舒张压等量升高
D.收缩压升高，舒张压降低
E.收缩压降低
答案
参考答案：A
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外周阻力和心率不变而搏出量增大时，动脉血压的变化主要是（）
A.收缩压升高
B.舒张压升高
C.收缩压和舒张压等量升高
D.收缩压升高，舒张压降低
E.收缩压降低
参考答案：A
There is a big in our city. We can see many there. A(n) ,the biggest animal on land is also there. Many birds fly in the sky(在天空飞).Some beautiful ducks (鸭子)always in the river. What are these in the trees? Oh, they are .They like leaves. They are from Australia. Aren’t they cute? There’s a tiger in the cage(笼子) under the tree. It eats meat every day. I like the best because it only lives in China and it’s the symbol of .
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