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【多选题】
下列关于β射线说法正确的有()。
A.
原子核发射出的β射线有两类:β-射线及β+射线
B.
β-射线就是电子,β+射线就是正电子
C.
β粒子来源于原子核的β衰变,β衰变有三种类型
D.
β衰变中发射的电子或正电子的能量是连续的,从0到极大值Eβ,MAX都有
E.
对某核素的电子的最大动能Eβ,MAX是确定的
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举一反三
【单选题】根据( )不同,可将商品分为生活资料商品和生产资料商品
A.
用途
B.
加工工艺
C.
化学成分
D.
原材料
【判断题】设备间的最小使用面积不得小于20M 2
A.
正确
B.
错误
【单选题】What was Jessica fond of reading when she was young?
A.
Classics recommended by the school.
B.
Classics on which Disney films are based.
C.
Stories about murders and poetry.
D.
Stories restricted by her parents.
【简答题】战略思想是指导企业( )制定和实施的基本思想。
【单选题】When she was reading the moving story, her eyes were { } with tears. ( )
A.
rattle
B.
stack
C.
define
D.
glisten
E.
fund
F.
tone
G.
toss
H.
relatively
【简答题】When I saw her, she was reading _______. 限A. an old, exciting, detective story B. an exciting, detective, old story C. a detective, old, exciting story D. anexciting, old, detective story
【简答题】She was ( interest ) in reading books when she was eight years old .
【简答题】Elliott was moved when she finished reading the letters.
【简答题】在方法中抛出异常采用_________ 语句。
【单选题】根据商品( )不同,可将商品分为生活资料商品和生产资料商品。
A.
基本用途
B.
原材料
C.
加工工艺
D.
化学成分
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