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【单选题】
为了直观地比较化疗后相同时间点上一组乳癌患者血清肌酐和血液尿素氮两项指标观察值的变异程度的大小,可选用的变异指标是()A.
标准差
B.
标准误
C.
相关系数
D.
变异系数
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举一反三
【单选题】大华公司2019年应交所得税30万元;年初的递延所得税资产余额为10万元,递延所得税负债余额为5万元;年末的递延所得税资产余额为15万元,递延所得税负债余额为10万元。则大华公司2019年应确认的所得税费用金额为( )万元。
A.
10
B.
20
C.
40
D.
30
【简答题】求下列三个二次曲面的公共径面． x 2 +y 2 +z 2 -2x+4y-11=0， 3y 2 +4xy-2xz+6z+5=0， 6x 2 -3y 2 +2z 2 +4xy-8xz-4x+4y-5=0.
【单选题】As a result of Williams' work ______.
A.
he did not get enough sleep
B.
there was an oily smell from his clothes
C.
the dog grew accustomed to travelling by train
D.
the dog was confused about the time of the day
【单选题】_________ sweet, the flowers in the botanic garden attract the visitor.
A.
Smelt
B.
To smell
C.
To be smelt
D.
Smelling
【单选题】An elephant uses its tusks for______.
A.
digging and lifting things
B.
washing
C.
drinking
D.
smelling
【单选题】Which is the most appropriate title for the passage?
A.
How to Avoide Being Affected by Smells
B.
Using Smells to Influence People
C.
The Power of Our Sense of Smell
D.
New Smells in Supermarkets
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