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【单选题】
雌三醇测定的目的是了解A.
胎儿胎盘功能
B.
胎儿宫内发育情况
C.
胎儿肝脏成熟情况
D.
胎儿皮肤成熟情况
E.
胎儿肾脏成熟情况
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反馈参考答案：
举一反三
【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.
【单选题】--- How is your vocation?-----____________
A.
Yes, thank you
B.
No, It’s very bad.
C.
Pretty fair, thanks
D.
Yes, fine. thank you.
【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
【单选题】Make authorship your __________, not your vocation.
A.
job
B.
profession
C.
work
D.
avocation
【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?
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