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【单选题】
若f(x)的导函数是cosx,则f(x)的一个原函数为A.
1+sinx
B.
1-sinx
C.
1+cosx
D.
1-cosx
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举一反三
【简答题】Cities can be frightened places. The majority of the population live in noisy massive tower blocks. The sense of belonging to a community tends to appear when you live thirty floors up in a skyscr...
【单选题】分层正注井的水进入油管后，经佩水嘴注入油层。其注水压力除了受油管摩擦阻力的影响外，还受水嘴阻力的影响，因此各层的注水压差( )。
A.
相同
B.
不同
C.
相等
D.
下降
【单选题】The crow was finally deceived because__________.
A.
it was not afraid of the men in the tower
B.
it did not have a number sense
C.
it could not distinguish between four and five
D.
four men left the tower
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