卵磷脂和Pluronic F-68均可用作静脉注射用乳剂的乳化剂。（）
参考答案：对
(2013·高考湖北卷)In much of the animal world，night is the time________for sleep－pure and simple.
A．set aside
B．set down
C．set off
D．set up
季相
