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【单选题】
连续时间信号f(t)是指( )。A.
t的取值是离散的，且f(t)的取值是离散的信号
B.
t的取值是离散的，而f(t)的取值是连续的信号
C.
t的取值是连续的，且f(t)的取值是连续的信号
D.
t的取值是连续的，而f(t)的取值是离散的信号
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举一反三
【单选题】My mother stood at the window watching our progress , and I turned towards her from time to time, hoping she would help. (Para.2)
A.
our slow and difficult movement towards the school; hoping she could stop my father from getting me to school
B.
our achievement; hoping she could stop my father from getting me to school
C.
our advancement; hoping she could help me in the school
【简答题】旅游距离越远,旅游者付出的代价就越大,旅游者承担的各种感知风险就越大,这是旅游距离知觉对旅为的________作用。旅游距离越远,神秘感就越强,越能激发旅游前往探索,这是旅游距离知觉对旅为的______作用。
【单选题】—How could you________ my mother so easily in the crowd? —Because she stood out in her red dress.
A.
pick up
B.
pick out
C.
take up
D.
take out
【简答题】某学习小组探究一小电珠在不同电压下的电功率大小,实验器材如图甲所示,现已完成部分导线的连接. 1 实验要求滑动变阻器的滑片从左到右移动过程中,电流表的示数从零开始逐渐增大,请按此要求用笔画线代替导线在图甲实物接线图中完成余下导线的连接; 2某次测量,电流表指针偏转如图乙所示,则电流表的示数为 ________A ; 3 该小组描绘出的伏安特性曲线如图丙所示,根据图线判断,将 ________ 只相...
【简答题】The Most Important Day in My Life [1] The most important day I remember in all my life is the one on which my teacher, Anne Mansfield Sullivan, came to me. I am filled with wonder when I consider the ...
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