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【单选题】
支气管哮喘的典型表现是A.
持续性呼气性呼吸困难
B.
发作性呼气性呼吸困难
C.
持续性吸气性呼吸困难
D.
发作性吸气性呼吸困难
E.
呼吸困难、咳嗽、咳痰
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反馈参考答案：
举一反三
【简答题】若已知L[f(t)]=F(s)= ,则f(0+)=_____;f(∞)=_____;
【单选题】A: How’s your vocation?
A.
( )
B.
Yes, not too well
C.
Quite good, what about you?
D.
Yes, fine, how are you, then?
E.
No, it’s bad.
【判断题】已知L[f1(t)]=F1(s),L[f2(t)]=F2(s),k1和k2为常数,则L[k1f1(t)+k2f2(t)]=k1F1(s)+k2F2(s).
A.
正确
B.
错误
【单选题】Have you ___ your parents of your plan for the winter vocation?
A.
inform
B.
told
C.
spoken
D.
informed
【简答题】若已知L[f(t)]=F(s)= ,则f(0+)=_____;f(∞)=_____;
【单选题】已知 L[f(t)]=F(s),则 L[f (3) ( t )] = :
A.
F(s-3)
B.
e -3 s F( S )
C.
s 3 F( S )
D.
F( S )/ s 3
【简答题】— What’s your plan for the summer vocation?
【单选题】The airport is usually your first stop before ________ on your vocation trip.
A.
leave
B.
leaving
C.
Now that
D.
If only
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