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【单选题】
数控机床与普通机床的进给传动系统的区别是数控机床采用( )。[单选题]A.
滑动丝杠螺母副
B.
滚动导轨
C.
滚珠丝杠螺母副
D.
滑动导轨
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知识点：
皮皮学刷刷变学霸
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【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
【单选题】设有double型变量a，b，c，e均有值，对代数式（3ae）/（bc），不正确的语言表达式是（）。
A.
3*a*e/b*c
B.
a*e/c/b*3
C.
3*a*e/b/c
D.
a/b/c*e*3
【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
【简答题】已知2x 2 +xy=6，3y 2 +2xy=9，求4x 2 +8xy+9y 2 的值为（ ）．
【简答题】[smel] n. & v. ( )
【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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