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【单选题】
当返回到初始位置时，撞击簧片开关．簧片开关触点闭合或迅速断开，然后才能执行打印，应采用（）的维修方法A.
清洁光敏遮断器或更换光敏三极管
B.
更换光敏遮断器
C.
调整簧片开关式字车初始位置传感器的簧片弹性
D.
更换簧片开关
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】—President Obama has never been to Beijing, ______ he? — He visited the Great Wall on the afternoon of November 18th,2011.
A.
hasn’t, No
B.
has, Yes
C.
hasn’t, Yes
D.
has, No
【简答题】-----Is this city _______ he visited the other day? ------No, this is the city ________ he was born. A, that , ,that B. the one, where C. the one, on which D. that , where
【单选题】he visited the new school, he showed great interest in everything he saw.
A.
It’s the first time
B.
For the first time
C.
The first time
D.
At first
【单选题】— What did he think of the trip to Beijing last month？ — He had such a good time ________ he visited the Great Wall.
A.
until
B.
that
C.
where
D.
when
【单选题】What did the man do firstly when he arrived in Paris?
A.
He visited a famous fountain.
B.
He visited some art galleries.
C.
He visited the Eiffel Tower.
D.
He visited a flea market.
【简答题】A．He worked there as a guide. B．He read about it. C．He had just visited it. D．He interviewed the sculptor.
【简答题】教育学真正成为一门科学,标志性的事件是《 》的出版。
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