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【单选题】
函数Y1、Y2、Y3的卡诺图表示如下,它们的逻辑关系是A.
Y1=Y2+Y3
B.
Y3=Y1·Y2
C.
Y1=Y2·Y3
D.
Y3=Y1+Y2
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【简答题】简要概述节约里程法的原理。
【单选题】From the passage, we can learn that “Greyhound” is probably the name of ______．
A.
an airline
B.
a hotel
C.
a website
D.
a bus company
【简答题】用sql语句建立选课表附表sc_back,其关系模式为sc_backsno,cno,grade, 其中 sno varchar9,cno char1,grade int, sno与cno为主键。
【单选题】静脉的结构特点为
A.
管壁由三层组成,内层为间皮
B.
中膜内的平滑肌较动脉的丰富
C.
起于右心房,止于毛细血管
D.
其吻合不如动脉的丰富
E.
与动脉相比,其管壁薄、管腔大
【简答题】（ ）are rates offered only to those prepared to sign a contract to give the airline a minimum annual tonnage．
【单选题】动静脉吻合的结构特点( )
A.
管壁较厚,纵行平滑肌发达
B.
管壁较厚,环行平滑肌发达
C.
管壁较厚,结缔组织丰富
D.
管壁较薄,平滑肌稀疏分散
E.
管壁较薄,少许环行平滑肌
【单选题】What can we know about the West Caribbean Airways?
A.
The financial conditions of the airline was just OK.
B.
It would be bought by the Colombian Aviation Authority.
C.
This was its second time to have lost its airplane this year.
D.
The company is on the edge of going bankruptcy.
【单选题】What can we know about the West Caribbean Airways?
A.
The financial conditions of the airline were just OK.
B.
It would be bought by the Colombian Aviation Authority.
C.
This was its second time to have lost its airplane this year.
D.
The company is on the edge of going bankruptcy.
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