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【单选题】
目前,国际海空联运的主要线路有远东— - 欧洲、远东—中南美和( )三条
A.
远东—亚洲
B.
远东—中近东、非洲、澳洲
C.
欧洲 --- 亚洲
D.
远东 --- 北美
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【判断题】逻辑思维在DNA双螺旋结构发现中起到了重要作用
A.
正确
B.
错误
【单选题】A pulse is applied to each input of a 2-input NAND gate. One pulse goes HIGH at t=0 and goes back LOW at t=1ms. The other pulse goes HIGH at t=0.7ms and goes back LOW at t=3ms. The output pulse can b...
A.
It goes LOW at t=0 and back HIGH at t=3ms.
B.
It goes LOW at t=0.7ms and back HIGH at t=3ms.
C.
It goes LOW at t=0.7ms and back HIGH at t=1ms.
D.
It goes HIGH at t=0.7ms and back LOW at t=1ms.
【单选题】A pulse is applied to each input of a 2-input NOR gate. One pulse goes HIGH at t=0 and goes back LOW at t=I ms. The other pulse goes HIGH at t=0.8 ms and goes back LOW at t=3 ms.The output pulse can b...
A.
It goes LOW at t=0 and back HIGH at t=3 ms.
B.
It goes LOW at t=0.8 ms and back HIGH at t=3 ms.
C.
It goes LOW at t=0.8 ms and back HIGH at t=l ms.
D.
It goes HIGH at t=0.8 ms and back LOW at t=1ms.
【单选题】开展公关活动时不可忽视的首要环节是(    )。
A.
公关调查    
B.
实施方案    
C.
公关策划    
D.
制订方案
【简答题】()是开展公关活动时不可忽视的首要环节。
【单选题】A pulse is applied to each input of an exclusive-OR gate. One pulse goes HIGH at t=0 and goes back LOW at t=I ms.The other pulse goes HIGH at t=0.8 ms and goes back LOW at t=3 ms.The output pulse can ...
A.
It goes HIGH at t=0 and back LOW at t=3 ms.
B.
It goes HIGH at t=0 and back LOW at t=0.8 ms.
C.
It goes HIGH at t=1 ms and back LOW at t=3 ms.
D.
both answers(b)and(c)
【单选题】A pulse is applied to each input of a 2-input NAND gate. One pulse goes HIGH at t=0 and goes back LOW at t=I ms. The other pulse goes HIGH at t=0.8 ms and goes back LOW at t=3 ms.The output pulse can ...
A.
lt goes LOW at t=0 and back HIGH at t=3 ms.
B.
It goes LOW at t=0.8 ms and back HIGH at t=3 ms.
C.
It goes LOW at t=0.8 ms and back HIGH at t=I ms.
D.
lt goes LOW at t=0.8 ms and back LOW at t=I ms.
【单选题】开展公关活动时不可忽视的首要环节是( )。
A.
公关调查
B.
公关策划
C.
公关实施
D.
公关评估
【单选题】She will call you if she ____. [     ]
A.
goes to
B.
go back
C.
come back
D.
comes back
【单选题】在南太平洋上,某北行船舶观测到强劲的ESE真风,根据风压关系判断低压应在 ________ 。
A.
船舶的右侧
B.
船舶的前方
C.
船舶的左侧
D.
船舶的后方
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