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【单选题】
Which of the following is not a form of the secondary ( 辅助 ) memory?
A.
RAM & ROM
B.
Hard disk
C.
Flash memory
D.
Optical disk
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 suppose to
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【单选题】只有p才q应该符号化为 ( )。
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【单选题】根据图1-39中的立体图,箭头指向所对应的视图为____。
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D.
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【判断题】“只有p才q”符号化为p→q
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B.
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【判断题】苷键的构型可以通过化合物的13C-NMR化学位移进行确定。
A.
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