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【单选题】
下列能使脉压增大的是（）A.
心率增快
B.
大动脉弹性降低
C.
射血期延长
D.
外周阻力增加
E.
每搏输出量减小
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【单选题】听力原文：M: What are you doing with this fruit? W: The child refuses to eat it without first picking out the stones. What is the woman doing?
A.
She is removing the stones of the fruit.
B.
She is refusing to eat the fruit.
C.
She is eating the fruit without the stones.
D.
She is picking stones before eating the fruit.
【简答题】Imagine a life without arms or legs! You can’t hold anyone without your 31 .You can’t walk anywhere without your feet. How would you last a day like that? Would you 32 at yourself in the mirror(镜子)lik...
【单选题】听力原文：M: Are you sure you can manage without your bike this afternoon, Amy? W: I have a computer exam tomorrow morning, so I have to sit down and do some preparations. In fact, you can also use it tomo...
A.
She needs help with her exam.
B.
The man can use her bike.
C.
Her bike needs repairing.
【简答题】以下电路中,为 型负反馈放大电路,能稳定 ,能 (减小还是增大)输入电阻。
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