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【单选题】
命题公式 P Q∧R 的对偶式是( )。A.
P (Q∨R)
B.
P∨(Q∧R)
C.
P∧(Q∨R)
D.
P∧(Q∨R)
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【简答题】No one was left in the museum now, and John was walking round to see if everything was all right. Suddenly he saw a beautiful painting lying on the floor. John picked it up and gave it to the director...
【单选题】--- Lucy seems in low spirits. --- Yes, all her efforts were ____ and no one was interested in her invention.
A.
in need
B.
in vain
C.
in place
D.
in use
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A.
总图制图标准
B.
水利水电工程制图标准
C.
技术制图标准
D.
铁路工程制图标准
【简答题】P assage One In the United States, it is important to be on time, or punctual, for an appointment, a class, a meeting, etc. This may not be true in all countries, however. An American professor discov...
【判断题】Grant was in favour of a society where all men were equal in the sense that no one was entitled to more than others were.
A.
正确
B.
错误
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