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【单选题】
细胞感受缺氧刺激与产生反应的可能机制是通过A.
促红细胞生成素增高
B.
血红素氧合酶-1活性增高
C.
糖酵解酶活性增高
D.
氧诱导因子或其它转录因子激活
E.
颈动脉体和主动脉体化学感受器对缺氧刺激反应
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Choose the best way to approach the guest in the following situation. Several guests remain in the restaurant after closing time. You say:
A.
You have to leave. We are closed.
B.
Can I ask that you leave?We have to clean up.
C.
I'm sorry for the inconvenience Sir, but our staff have to clean the restaurant.
【单选题】Choose the best way to approach the guest in the following situation. A person asks you which room is Mr Smith in. You say:
A.
I cannot tell you.
B.
If you ask at reception, they may be able to help.
C.
I don't know.
【单选题】Choose the best way to approach the guest in the following situation. The guest orders salmon, but there is no salmon left. You say:
A.
Oh, I'm sorry. We're all out of salmon. Perhaps the trout would be a good choice for you?
B.
No, there's no salmon left.
C.
No, the salmon is finished for the night.
【单选题】Choose the best way to approach the guest in the following situation. You don't have any room in your restaurant. You say:
A.
I'm sorry, sir. We're full.
B.
I'm very sorry, sir. We don't have any tables available at this time.
C.
We are full.
【单选题】Choose the best way to approach the guest in the following situation. If a guest says ''Thank you''. You say:
A.
No worries.
B.
You are most welcome.
C.
Not a big deal.
【简答题】试求图示各杆1-1,2-2,3-3截面上的轴力,并作轴力图。
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