【单选题】We have to ask you to ( ) the time of shipment in you L/C No. 234 from 7 June t015 June.
【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<='0'||c>='9'&&c<='A'||c>='Z'&&c<='a'||c>='z'
B.
!(c<='0'||c>='9'&&c<='A'||c>='Z'&&c<='a'||c>='z')
C.
c>='0'&&c<='9'||c>='A'&&c<='Z'||c>='a'&&c<='z'
D.
!(c>='0'&&c<='9'||c>='A'&&c<='Z'||c>='a'&&c<='z')
【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< span="">
D.
!(c>=48&&c<=57||c>=65&&c<=90||c>=97&&c<=122)< span="">
【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
【判断题】电子政务主要借助了计算机技术、电视技术和卫星技术。()
【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】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
D.
!(c>=48&&c<=57||c>=65&&c<=90||c>=97&&c<=122)