【简答题】A.He has to finish his homework. B.He doesn t know it is very late. C.His mother wants him to do homework. D.He can t sleep.
【单选题】轻钢门式刚架结构柱间支撑的间距一般为30m~40m,不应大于( )。
【单选题】It is very difficult for non-governmental organizations to measure the ______ of the aid they supply to developing nations.
【单选题】轻钢门式刚架结构柱间支撑的间距一般为30m~40m,不应大于( )。
【单选题】提高装卸搬运作业效率的有效方法是( )。
【单选题】轻钢门式刚架结构柱间支撑的间距一般为30m~40m,不应大于( )。