玻璃钢夹砂管道管壁中树脂的不可溶分含量应≥（）%.
参考答案：90
--- Can you tell me________?
--- I lost my MP3 player.
A．what’s the matter with you
B．what the matter is with you
C．what the matter you is
D．what the matter with you are
生态学的研究内容和范围非常广泛，所以没有特殊的研究对象。 ( )
