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【简答题】
动力实验中常用的半固体培养基中琼脂的含量为(),若穿刺线清晰记为动力(),若穿刺线模糊,有扩散生长的迹象()。(后两个空填写,阳性或阴性)
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举一反三
【单选题】() at the meeting are some experienced teachers.
A.
Presented
B.
Having been present
C.
Being presented
D.
Present
【单选题】The author is concerned with ______.
A.
analyzing the psychology of children having difficulties to make friends
B.
explaining why some children can't make friends successfully
C.
introducing how to instruct children to make friends
D.
illustrating the role of parents to help children make friends
【单选题】_____ having some money raises our level of happiness, having too much money does not.
A.
While
B.
When
C.
As
D.
Until
【简答题】A．Having a good knowledge of its customs. B．Knowing some key people in tourism. C．Having been to the country before. D．Being able to speak Japanese.
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