小龙骨间距应按设计要求,设计无要求时,应按罩面板规格决定,一般为()。
参考答案:400mm~500mm
— I bought a tie for Dad on Father's Day yesterday.
— . [ ]
A. It's nothing
B. I would, thanks
C. That's special enough
D. I didn't mind
发展休闲农业的重要意义。