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【简答题】
画出集合A={2，3，6，12，24，36}上整除关系的哈斯图。并指出最大元、最、极大元和极。
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举一反三
【单选题】When moist air moves over a cooler surface, then may occur.
A.
frontal fog
B.
steam fog
C.
advection fog
D.
radiation fog
【单选题】People begin to know that most environmental problems exist because necessary measures for preventing them _____ taken in the past. [ ]
A.
are not
B.
were not
C.
hadn't been
D.
wouldn't be
【单选题】When moisture air moves over a cooler surface, then may occur.
A.
advection fog
B.
radiation fog
C.
frontal fog
D.
steam fog
【单选题】Most(75)measures involve data encryption and password.
A.
security
B.
hardware
C.
display
D.
program
【单选题】According to the passage, the comfort zone for most African people ______.
A.
measures about 21 inches
B.
varies from person to person
C.
implies respect
D.
is regulated by status
【单选题】Most ______ measures involve data encryption and password.
A.
security
B.
hardware
C.
display
D.
program
【单选题】When moist air moves over a cooler surface, then ( ) may occur.
A.
Advection fog
B.
Radiation fog
C.
Frontal fog
D.
Steam fog
【单选题】Most environmental problems exist because adequate measures for preventing them _________ taken in the past.
A.
was not
B.
were not
C.
were not being
D.
being not
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