【单选题】在教学中学生对认识性问题作出反应后,教师应采取鲜明的客观态度。对学生的反应教师不置可否的做法将不利于学生正确认识的形成。但是,表示否定的态度应该注意委婉,以保护学生参与反应的积极性。这是属于强化技能的哪个构成要素?( )
【简答题】完形填空。 Welcome to my home, Tom. Look! This is a photo of a 1 . 2 the photo, there is a big tree. Some birds(鸟) 3 in the tree. And some 4 have a picnic near(在……附近) the tree. The little boy asks the girl...
【判断题】对主梁进行火焰矫正时,加热点愈靠近跨中,主梁起拱效果越不明显。
【单选题】This is a photo of______.
【单选题】This is a photo of our school.
【判断题】Tony and Don Shirley have nurtured a friendship and understanding that would change both their lives.
【多选题】在纯电感电路中,电压与电流的关系是()。
B.
电流的相位滞后于外加电压u为π/2(即90°)
C.
电流的相位超前于外加电压u为π/2(即90°)