【简答题】短文改错 Recently, my classmates have had a hea ted discussion about if we should have optional courses (选修课) in high schools. Some students were in favor of optional courses. They say interest is best t...
【判断题】在真空的静电场中,通过任一闭合曲面的电场强度通量等于该闭合曲面所包围的电荷的代数和。
【简答题】荷兰生物学家拜登代克提出了______ 。
【判断题】均值标准差控制图是均值控制图和标准差控制图的结合。()
【单选题】We have new work tomorrow, so we should have all this work .
【简答题】结合中国古代神话传说,谈谈对治水的认识。