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【简答题】
化合物YX2和ZX2中，X、Y、Z三种元素位于周期表中前三周期，X与Y属于同一周期，Y与Z是同主族元素.Y原子的核外电子层数与次外层电子数相等，最外层电子数是次外层电子数的2倍.X原子最外层电子数比次外层电子数多4个.Z元素的名称是 ，YX2的分子式为 .
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举一反三
【单选题】Which statement regarding committed and discretionary fixed costs is true?
A.
a. Discretionary fixed costs preserve management's flexibility.
B.
b. Committed fixed costs preserve management's flexibility.
C.
c. Both discretionary and committed fixed costs preserve flexibility.
D.
d. Both discretionary and committed fixed costs limit flexibility.
【简答题】discretionary
【单选题】An example of a discretionary fixed cost is
A.
insurance
B.
taxed on real estate
C.
management training
D.
depreciation of buildings and equipment
【单选题】The word 'discretionary' in the next to the last paragraph means______.
A.
discreditable
B.
incretionary
C.
disposable
D.
incredible
【简答题】如何打开Animate软件中的各种面板?
【简答题】根据《药品不良反应监督管理办法》下列情形属于药品严重不良反应的有
【单选题】The discretionary budget category covers all the following EXCEPT ______.
A.
Government spending
B.
Human Services
C.
Education
D.
Health
【单选题】某大学有10个二级学院,共有学生5000人,教师300人,设置专业27个。若以每个二级学院为调查单位,则总体单位总量是( )
A.
10
B.
5000
C.
300
D.
27
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