《无障碍设计规范》规定，桥梁、隧道的人行道应与道路的人行道衔接，当地面有高差时，应设轮椅坡道，坡道的坡度不应大于：( )

He was late for work this morning because he_______find...

单项选择题He was late for work this morning because he_______find his key．

以下属于可以对细胞的某些结构进行标记的荧光染料是（ ） A、双偶氮苯酚 B、Alexa568 C、FITC D...

多项选择题以下属于可以对细胞的某些结构进行标记的荧光染料是（ ）
A、双偶氮苯酚
B、Alexa568
C、FITC
D、醋酸铀

He' s a great player and I have a lot of respect_______...

单项选择题He' s a great player and I have a lot of respect_______him．