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【单选题】
若 x (t) 是己录制声音的磁带,则下列表述错误的是 :A.
x (-t) 表示将此磁带倒转播放产生的信号
B.
x (2t) 表示将此磁带速度降低一半播放
C.
x (t-t 0 ) 表示将此磁带延迟 t 0 时间播放
D.
2 x (t) 表示将磁带的音量放大一倍播放
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皮皮学刷刷变学霸
举一反三
【简答题】Sometimes ideas are more p______________(强大) than any amount of money.
【简答题】Sometimes ideas are more_______ than any amount of money. 有时候思想比任何数目的一笔钱都更强大。
【单选题】The students have been working hard on their lessons and their efforts (reward) with success in the end.
A.
will be rewarded
B.
are rewarded
C.
were rewarded
【单选题】The men work all week in the factory, and at the end of the week they get their pay. Naturally enough, they open the envelopes and they all count the money. One man is standing in the comer. He's coun...
A.
once a month
B.
twice a month
C.
once a week
D.
every five days
【单选题】The students have been working hard on their lessons and their efforts with success in the end.
A.
rewarded
B.
were rewarded
C.
will reward
D.
will be rewarded
【单选题】The students have been working hard on their lessons and their efforts __ success in the end.
A.
rewarded
B.
were rewarded
C.
will reward
D.
will be rewarded
【判断题】一家快餐公司通过视频分析等候队列的长度,然后自动变化电子菜单显示的内容。如果队列较长,则显示可以快速供给的食物;如果队列较短,则显示那些利润较高但准备时间相对长的食品。这是基于大数据分析的结果。
A.
正确
B.
错误
【单选题】She is a strange girl and sometimes her ideas are hard _______
A.
to be understood
B.
to understand
C.
understanding
D.
understood
【单选题】In the end the masses will lose faith in them, which will hamper their development.
A.
promote
B.
lull
C.
facilitate
D.
hinder
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