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【单选题】
菲涅耳用什么思想补充了原理，发展成了—菲涅耳原理。A.
反射 波
B.
相干波
C.
子波
D.
子波相干叠加
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皮皮学刷刷变学霸
举一反三
【单选题】I when there came a knock at the door.A．am going to bedB．just about to go to bedC．was about to go
A.
7. I when there came a knock at the door. A．am going to bed
B.
just about to go to bed
C.
was about to go to bed
D.
have gone to bed
【单选题】Speaker A: Im worried about those classes I missed when I was sick. Speaker B:______
A.
I am glad that you have got well.
B.
Don't worry. Everything will be all right.
C.
I'll try to bring you up to date on what we've done.
D.
Maybe you should explain to our teacher why you were absent from class last week.
【单选题】15 When did the accident happen?
A.
At about 8：00 am
B.
At about 9：00 am
C.
At aboutl0：00 am
【单选题】Now when talking about economic reform. I am very ______ aware of the shadow hanging over most African countries' debt.
A.
well
B.
far
C.
much
D.
greatly
【单选题】(12)引入二叉线索树的目的是( )。
A.
加快查找结点的前驱或后继的速度
B.
为了能方便的找到双亲
C.
为了能在二叉树中方便的进行插入与删除
D.
使二叉树的遍历结果唯一
【单选题】When did the accident happen?
A.
at about 8:00 am
B.
at about 9:00 am
C.
at about 10:00 am
【单选题】----Could you lend me that book you ____ me about when I telephoned you? -----No,I am sorry, I can’t. I gave it to a friend.
A.
were telling
B.
would tell
C.
had told
D.
had been telling
【单选题】When did the accident happen?
A.
At about 8:00 am.
B.
At about 9:00 am.
C.
At about 10:00 am.
【单选题】when did the accident happen ?
A.
at about 8:00 am
B.
at about 9:00am
C.
at about 10:00am
【单选题】引入二叉线索树的目的是 ( )
A.
加快查找结点的前驱或后继的速度
B.
为了能在二叉树中方便地进行插入与删除
C.
为了能方便地找到双亲
D.
使二叉树的遍历结果唯一
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