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【单选题】
命题“若a＞b，则2 a ＞2 b －1”的否命题为( )A.
若a＞b，则有2 a ≤2 b －1．
B.
若a≤b，则有2 a ≤2 b －1．
C.
若a≤b，则有2 a ＞2 b －1．
D.
若2 a ≤2 b －1，则有a≤b．
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反馈参考答案：
举一反三
【简答题】_________是无线传感节点中负责计算的核心。
【单选题】Recycling is one way to protect the enviroment; reusing is _____
A.
another
B.
the other
C.
one another
D.
one
【简答题】The table shows household spending on various items as a percentage of the total in a Chinese city in 1990 and 2005. Summarise the information by selecting and reporting the main features and by makin...
【单选题】The phrase 'synergistic effect' in the last paragraph is closest in meaning to ______.
A.
mixing effect
B.
mixed function
C.
combined result
D.
cooperated effect
【简答题】协同作用（synergistic effect）
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