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【单选题】
雷达测量大目标方位时,为消除CRT光点直径对的扩大效应,应该______。A.
用EBL与进行同侧外缘重合
B.
用EBL与进行异侧外缘重合
C.
用EBL与进行同侧内缘重合
D.
用EBL与进行异侧内缘重合
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皮皮学刷刷变学霸
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【简答题】半导体中中存在两种载流子:____和____。纯净的半导体称为____,它的导电能力很差。掺有少量其他元素的半导体称为杂质半导体。杂质半导体分为两种:N型半导体--多数载流子是____;P型半导体--多数载流子是____。当把P型半导体和N型半导体结合在一起时,在两者的交界处形成一个____结,这是制造半导体器件的基础。
【单选题】-- I'm sorry to have shouted at you. I didn't mean to be so rude.--You were very angry. Anyway, ______.
A.
you're welcome
B.
that's right
C.
it doesn't matter
D.
I'm sorry about that
【单选题】A supermarket places its store brand of blackberry jam priced at $5 per jar in the fruit preserves aisle, alongside the jam jars of a better known brand—whose products are priced at $8 apiece. Store m...
A.
by-product pricing
B.
product bundle pricing
C.
captive product pricing
D.
psychological pricing
E.
seasonal pricing
【单选题】I'm sorry to trouble you. ---( )
A.
-You are welcome.
B.
You can't say so.
C.
With pleasure.
D.
Not at all.
【单选题】I'm sorry to you so much trouble. I hope you can forgive me and have a good rest now.
A.
give
B.
be given
C.
have given
D.
be giving
【单选题】十九大报告指出,全面()是国家治理的一场深刻革命,必须坚持厉行法治,推进科学立法、严格执法、公正司法、全民守法。
A.
依法治国
B.
依法行政
C.
以德治国
D.
以德理政
【简答题】纯净的具有晶体结构的半导体称为 ,常用半导体材料有 和 ,它们都是4价元素,原子外层有 个价电子,且在相邻原子之间形成稳定的 结构,因此载流子浓度很低,所以导电能力 。
【单选题】-I'm sorry to have shouted at you. I didn't mean to be so rude to you. -You were very angry. Anyway, ____.
A.
you're right
B.
you're kind
C.
it doesn't matter
D.
I'm sorry
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