【单选题】Now I am enjoying learning and I got _____ A this term. [ ]
【单选题】— How is your English study? — Not bad. But I learning English grammar.
【单选题】直流电机单迭绕组的并联支路对数等于( )
【单选题】I ______ English ever since I came here in the United States three years ago.
【简答题】衰老或休眠的筛管中,在筛板上会大量积累(),形成垫状的()封闭筛孔,当次年春季筛管重新活动时,()能消失,()又能重新沟通。
【单选题】Now I am enjoying learning English ______ I got an A this term. [ ]
【简答题】在衰老或休眠的筛管中,在筛板上会大量的_____,形成垫状的_____封闭筛孔。