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【简答题】
However , it wasn't all sweetness and light.There was a reported coldness between the cat and dog in 25% of the homes , while aggression and fighting were observed in 10% of the homes.One reason for this is probably that some of their body signals were just opposite.For example , when a cat turns its head away , it signals aggression , while a dog doing the same signals submission.
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【单选题】已知全集U={1,2,3,4,5,6,7,8},A={1,4,6},B={4,5,7},则(C U A)∩(C U B)等于(  )
A.
{2,3,4,8}
B.
{2,3,8}
C.
{2,4,8}
D.
{3,4,8}
【简答题】用3个5和3个0组成一个六位数:只读一个零的六位数是______,读出两个零的六位数是______,组成最小的六位数是______.
【简答题】The creditors can protect their identity in the following ways except
【简答题】用2、5、0、9、7、8六个数字,组成最大的六位数是______,最小的六位数是______.
【简答题】用4,6,8,5,9,0这六个数字组成最小的六位数是______,组成最大的六位数是______.
【单选题】下列用于AC/A比率测量的综合验光仪内置辅镜是( )
A.
PH
B.
P45
C.
P135
D.
6U与10I
【简答题】用三个0、二个1、一个9写出数最大的六位数是______,最小的六位数是______.
【简答题】最大的五位数是(    ),最小的六位数是(    ),它们的差是(    ),它们的和是(    )。
【单选题】In CA6140 ,( ) can automatically disconnect the motion to protect the machine tool in case of overload or accident .
A.
Interlock mechanism
B.
safety clutch
C.
over-run clutch
D.
friction clutch
【单选题】设全集U={1,2,3,4,5,6,7,8},集合A={1,2,3,5},B={2,4,6},则(C u A)∩B=(  )
A.
{2}
B.
{4,6}
C.
{l,3,5}
D.
{4,6,7,8}
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