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【单选题】
关于光学对比度,叙述错误的是
A.
依存于被照体对 X 线的不同吸收
B.
受胶片特性影响
C.
被照体的天然差别是基础
D.
是照片上相邻组织影像的密度差
E.
单面药膜与双面药膜对比度无差别
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A.
John Kennedy
B.
Abraham Lincoln
C.
George Washington
D.
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【判断题】指针式万用表用完后应将切换开关放到"直流电压"档上。(X)
A.
正确
B.
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【单选题】John Martin trusted people easily because
A.
he was good-hearted and liked to cooperate with other people in his work.
B.
he was hardly aware of the possible danger.
C.
he was at a loss for the fact that industrial spying was on the increase.
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【判断题】John had to cut his visit shortly two days ahead of time.()
A.
正确
B.
错误
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【单选题】______ was known for his famous speech '1 Have a Dream'.
A.
John F. Kennedy
B.
Martin Luther King, Jr
C.
Abraham Lincoln
D.
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【单选题】John Martin is Visiting( ).
A.
Xiao Li 's hometown.
B.
a town near where Xiao Li lives
C.
a shopping mall
D.
supermarket
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【判断题】九月九日是指重阳节。
A.
正确
B.
错误
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【简答题】What is the purpose of Martin Blade's visit?
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【判断题】自定义零件 型材、铆钉 的参数可在定义的值范围中任意设置。
A.
正确
B.
错误
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【单选题】Which American president was at the same time period with Martin Luther King Jr.?
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John Kennedy
B.
Abraham Lincoln
C.
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D.
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【判断题】指针式万用表用完后应将切换开关放到"直流电压"档上。(X)
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he was good-hearted and liked to cooperate with other people in his work.
B.
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C.
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B.
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