【单选题】He had put the hat ______ and taken it off again three times.
【多选题】羊毛按组成的纤维类型成分,可分为同质毛和异质毛,而同质毛根据其细度可分为几种?()
【单选题】He had put the hat __________ and taken it off again three times.
【单选题】He had put the hat __________ and taken it off again three times.
【简答题】毛是羊毛中最常见也是产量最大的一个类,其种类也相当多,如果按羊毛粗细可分为 、半细毛、粗毛和长毛四个类型。
【单选题】He had put the hat __________ and taken it off again three times.
【简答题】是羊毛中最常见也是产量最大的一个类,其种类也相当多,如果按羊毛粗细可分为 、半细毛、粗毛和长毛四个类型。