【单选题】低沸点易燃液体贮槽上应安装________。
【判断题】8 用几何法求平面汇交力系的合力时,可依次画出各个力矢,这样将会得到一个分力矢与合力矢首尾相接并自行封闭的力多边形。
【判断题】用几何法求平面汇交力系的合力时,可依次画出各个力矢,这样将会得到一个分力矢与合力矢首尾相接并自行封闭的力多边形。()
【单选题】— Sorry, I forgot_________ you that the party wouldn't be held tonight. — That's all right. Mary has told me about it.
A.
That's all right. Mary has told me about it.
【单选题】---Has Mary told you about her________ as a kid? ---Yes. She ______ all sorts of difficulties and hardships.
A.
experience; was experienced
B.
experience; had experienced
C.
experiences; was experienced
D.
experiences; experienced
【单选题】根据我国现行宪法的规定,农村群众的宅基地、自留地、自留山的所有权归属于
【多选题】在y对x是线性回归模型 中,随机误差u产生的原因有()