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【单选题】
人类与动物在条件反射方面的主要区别是A.
能形成条件反射
B.
具有第一信号系统
C.
条件反射分化程度
D.
条件反射消退程度
E.
具有第二信号系统
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反馈参考答案：
举一反三
【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. 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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