下列能直接体现科学发展观第一要义的是( )
根据对话内容回答问题
A: Hello! Is that Mike?
B: No. This is Tom.
A: Hi, Tom. This is John. How are you?
B: Fine, thanks.
A: Is Mike in?
B: Sorry, he isn't. He's at school.
A: OK. Thank you. Bye—bye!
B: Bye!
在化学实验室内外一般不会张贴的标志是( )
一部动画片总共15集,每集播放21分钟,每天从18:25播到19:00,多少天可以播完?