观察临时装片时,视野里出现了污点,污点不可能在( )
A:物镜上
B:目镜上
C:装片上
D:反光镜上
澳门在建立特别行政区之前曾被哪个国家侵占达400多年?
She reached the top of the hill and stopped _______ on a big rock by the side of the path.
如何正确行使权利?
(Ⅰ)求函数h(x)=f(x)•g(x)在﹣1,1上极值点的个数;
(Ⅱ)令函数p(x)=f'(x)•g(x),若∀a∈1,3,函数p(x)在区间b+a﹣ea,+∞上均为增函数,求证:b≥e3﹣7.