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【单选题】
是指为确保采取旨在保护港口实施和港口设施内的船舶、人员、货物、货物运输单元和船上物料免受保安事件威胁的措施而制订的计划A.
SSA
B.
SSP
C.
PFSP
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举一反三
【单选题】将 xOy 平面内的椭圆 x^2/4+y^2/9=1 绕 y 轴旋转一周, 所得旋转曲面方程为
A.
x^2/9+y^2/4+z^2/9=1
B.
x^2/4+y^2/9+z^2/9=1
C.
x^2/9+y^2/4+z^2/4=1
D.
x^2/4+y^2/9+z^2/4=1
【单选题】What are types of condition disturbance?
A.
Refers to some types of noise which makes it possible to transmit message
B.
Refers to the major types of noise which makes it impossible to transmit message
C.
Refers to the noise which disturbs to transmit message
D.
Refers to all kinds of noise
【单选题】According to the passage, what is believed to cause the thin lines seen on Europa's surface?
A.
A long period of extremely high tides
B.
Water breaking through from beneath the surface ice
C.
The continuous pressure of slush on top of the ice
D.
Heat generated by the hot rocky core
【单选题】听力原文： A dictionary lists the words of a language, usually arranged in alphabetical order, but sometimes also by topic, with their meanings or their equivalents. The first important contribution to lex...
A.
The American Spelling Book.
B.
Compendious Dictionary of the English Language.
C.
An American Dictionary of the English Language.
D.
Webster's International Dictionary.
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