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【单选题】
表面结构常用的轮廓参数中,高度参数Ra 表示A.
算术平均偏差
B.
轮廓的最大高度
C.
轮廓微观不平度十点高度
D.
直线度
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举一反三
【单选题】听力原文：W: 1 don't think we should have told Alien about the surprise party for Sue. M: It's all right. He doesn't make promises lightly, and he promised not to tell. Q: What does the man mean? (19)
A.
That Sue already knows about the party.
B.
That Alien doesn't know Sue.
C.
That Alien will probably tell Sue about the party.
D.
That Alien won't tell Sue about the party.
【单选题】We enter the alien world through the eyes of , a former Marine confined to a wheelchair.
A.
Neytiri
B.
Colonel Miles Quaritch
C.
Dr. Grace Augustine
D.
Jake Sully
【单选题】（ ）又称“密集型策略”，是指公司集中所有力量来满足一个或几个细分市场的需求。
A.
集中性市场营销策略
B.
差异性市场营销策略
C.
无差异市场营销策略
D.
分散性市场营销策略
【单选题】下列有关铸造金属全冠牙体预备要求的说法中错误的是()
A.
两邻面应近于平行
B.
无倒凹,最大周径降至龈缘
C.
轴线角应清楚分明呈直角
D.
合缘、轴角、轴面均应磨光
E.
龈缘线相连应一致
【单选题】听力原文： Today when a man steps on to the moon, or something new and important happens, the world learns about it immediately. What did the newspapers say about that first flight in 1903? Strangely enoug...
A.
They were able to fly it in the air.
B.
They were able to stay up in the air for half an hour and more in the machine.
C.
They were able to carry travelers.
D.
They were able to fly in around Dayton.
【单选题】下列有关铸造金属全冠牙体预备要求的说法中错误的是
A.
两邻面应近于平行
B.
无倒凹，最大周径降至龈缘
C.
轴线角应清楚分明呈直角
D.
牙合缘、轴角、轴面均应光滑圆钝
【单选题】下列有关铸造金属全冠牙体预备要求的说法中错误的是（）
A.
两邻面应近于平行
B.
无倒凹，最大周径降至龈缘
C.
轴线角应清楚分明呈直角
D.
缘、轴角、轴面均应磨光
E.
龈缘线相连应一致
【判断题】专项检测室针对我国曾经发生的某些重大食品安全事件、污染区域中指示性食品和问题食品、包装材料、生产加工中的特定动物性产品和特定目的进行的调查，由指定的检验机构开展。
A.
正确
B.
错误
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