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【简答题】
已知sinαcosα= 1 4 ，且 π 4 ＜α＜ π 2 ，则cosα-sinα=______．
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皮皮学刷刷变学霸
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【简答题】下列经济业务中，引起会计等式两边同时变化的有（ ）。
【单选题】If marginal cost is increasing then:
A.
marginal product must be increasing.
B.
average variable cost must be increasing.
C.
average total cost must be increasing.
D.
none of the above must necessarily be true.
【单选题】Theoretically, an increase in the real wag
A.
increases leisure.
B.
decreases leisure.
C.
has an ambiguous effect on leisure.
D.
has no effect on leisure.
【单选题】What abruptly ended Thompson's dream of the past?
A.
The realization that this wag only a time-consuming fantasy.
B.
The glimpse of an important clue to future discovery.
C.
A resolution derived from his fantasy that he must learn more about this great past city.
D.
The locating of the mysterious Sacred Welt.
【简答题】阅读理解。 Dogs wag (摇摆) their tails in different directions depending on whether they are excited and wanting to move forward or threatened and thinking of moving back, a study has found. Researchers in I...
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