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【简答题】
如图为示波器面板,屏上显示的是一亮度很低,线条较粗且模糊不清的波形 . ( 1 )若要增大显示波形的亮度,应调节 _____ ( 2 )若要屏上波形线条变细且边缘清晰,应调节 _______ ( 3 )若要将波形曲线调至屏中央,应调节 _______ 与 ________ 旋钮。 2 、如图所示,图甲为示波器上的面板,图信号源 . ( 1 )若要观测此信号源发出的如图丙所示的正弦交流信号,信号源的 a 端与示波器面板上的 _______ 接线柱相连, b 端与 _______ 接线柱相连 . ( 2 )若示波器显示屏上显示的波形如图丁所示,要使波形横向展宽,应调节 __ ____ 旋钮 . ( 3 )若将信号源改为一节干电池的直流电源,并已正确接入示波器,此时 DC 、 AC 开关应置于 ___________ 位置(填“ DC ”或“ AC ”)
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【单选题】Which of the following is CORRECT about Mickey, the garbage collector?
A.
He wrote a letter to the couple afterwards.
B.
He failed to collect the money from the bank.
C.
He wanted the couple to send him a Christmas card.
D.
He collected both the cheek and the garbage that day.
【简答题】A Xia Ming was worried about his study, so he wrote a letter to a magazine. Dear editors, I’m a slow student in my class. Most of my classmates are much better than me. So I get very stressed out. I...
【单选题】Which of the following is CORRECT about Mickey, the garbage collector?
A.
He wrote a letter to the couple afterwards.
B.
He failed to collect the money from the bank.
C.
He wanted the couple to send him a Christmas card.
D.
He collected both the check and the garbage that day.
【单选题】He wrote a letter to me _______ that his trip to Japan had been put off because of the bad weather.
A.
inform
B.
informing
C.
informed
D.
being informed
【简答题】He wrote a letter of complaint (投诉), and the company has promised to look the matter.A. into
【简答题】金融市场未能从中国封建社会经济发展中自然产生，根本原因是殖民政策破坏的结果。
【简答题】He wrote a letter of complaint ( 投诉 ), and the company has promised to look ________ the matter.
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