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【单选题】
下列关于休止角的表述,正确的是 ( )A.
粒子表面粗糙的物料休止角小
B.
休止角小于30°，物料的流动性好
C.
休止角与物料的流动性没关系
D.
止角越大，物料的流动性越好
E.
大的物料休止角大
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】听力原文：W: Excuse me, sir. M: Yes, what is it? W: I'm afraid you are not supposed to use a mobile phone during the flight. It will interfere with the systems. M: Oh, I see. I'm sorry.. I didn't realize i...
A.
On a plane.
B.
At a hotel.
C.
At a company.
D.
At the airport.
【多选题】下面哪些描述是正确的
A.
大数据时代无需抽样调查
B.
描述性分析方法是推断性分析方法的基础
C.
如果拥有总体数据，无需参数估计及假设检验
D.
现在的调查不用考虑数据类型
【多选题】下面哪些描述是正确的
A.
频数分布表即适合整理质别数据也适合整理量别数据
B.
直方图即适合整理质别数据也适合整理量别数据
C.
箱索图能判数据中是否存在异常值
D.
最适合比较多组数据分布特征的图是箱索图
【单选题】听力原文：M: Come in! W: Er, excuse me, professor Serafin, are you busy? M: No, Miss Van Pelt, I've always got time for you. There're several things I want to talk to you about. W: Oh, really? M: Yes, er, ...
A.
Homework.
B.
Seminar presentation.
C.
Health.
D.
Class attendance.
【单选题】下面哪些描述是正确的
A.
钳子很有用是因为它们能够夹住所有规格的螺栓
B.
割钳可用于切断经硬化处理的线材
C.
可调铰接式钳子可用于夹住大物件
D.
卡环钳子用于切断卡环
【单选题】听力原文：M: Excuse me, Madam. W: Yes? M: How can I get to the Chaoyang Park? W: Take the bus No. 331 to the final stop. M: It's very kind of you. W: My pleasure. What is the relationship between the speak...
A.
They are friends.
B.
They are strangers.
C.
They are brother and sister.
【单选题】It is true that these herbs ( 草药 ) can be used to _________ pain.
A.
relief
B.
relieve
C.
worsen
D.
recognize
【简答题】It is true that these herbs can be used to _______(减轻) pain.
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