已知
是f(x)当x≥1时的一个原函数,则
=______.
参考答案:-2
解析:
[分析]: 由题设知 [*] 用分部积分法计算定积分,得 [*]
—Could you tell us _____ to travel from Earth to Mars by spaceship?
—It takes months, I think.[ ]
A. how far it takes
B. how long it takes
C. how long does it tak
D. how soon does it take
T细胞分化成熟的场所是
A.骨髓B.胸腺C.腔上囊D.淋巴结E.脾