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【单选题】
设曲线 与直线 相交于 两点 , 又 为曲线弧 上任一点 , 求 面积的最大值 .A.
2
B.
4
C.
6
D.
8
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【单选题】We have to ask you to ( ) the time of shipment in you L/C No. 234 from 7 June t015 June.
A.
extend
B.
cut
C.
Increasing
D.
decrease
【单选题】电子政务主要借助了（）
A.
信息技术、数据库技术和计算机技术
B.
信息技术、网络技术和办公自动化技术
C.
计算机技术、电视技术和卫星技术
D.
网络、计算机技术和卫星技术
【单选题】Which statement is not true according to the passage?
A.
U. S. health officials are increasing surveillance measures at doctors' offices.
B.
So far, the cases of swine flu in the United States are not very serious.
C.
U. S. officials are determined to take more aggressive actions against swine flu.
D.
Besser says the number of infections will probably rise.
【单选题】You may improve a vessels stability by _____.
A.
keeping the fuel tanks topped off
B.
increasing the free surface effect
C.
keeping the fuel tanks at least half MI
D.
keeping at least one fuel tank empty for slops
【单选题】电子政务主要借助了( )
A.
信息技术、办公自动化技术和网络技术
B.
现代计算机技术、通信技术和网络技术
C.
现代计算机技术、电视技术和卫星技术
D.
现代计算机技术、卫星技术和网络技术
【单选题】How can we avoid a worldwide water shortage in the future?
A.
We can invent ways of increasing rainfall.
B.
We can develop ways of reusing water.
C.
We may use less water.
D.
We may build fewer steel plants.
【单选题】—How is Dennis getting along with his work? —Well, he could always __________ a new idea for increasing sales.
A.
come up with
B.
come about
C.
get away with
D.
get up
【单选题】为判断字符变量c的值不是数字也不是字母时,应采用下述表达式( )
A.
c<=48||c>=57&&c<=65||c>=90&&c<=97||c>=122
B.
!(c<=48||c>=57&&c<=65||c>=90&&c<=97||c>=122)
C.
c>=48&&c<=57||c>=65&&c<=90||c>=97&&c<=122< /div>
D.
!(c>=48&&c<=57||c>=65&&c<=90||c>=97&&c<=122)< /div>
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