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a.
步进电机

b.
交流伺服电机

c.
直线电机

d.
异步电机
  积分
 参考答案:
 佳题速递:
  • 直线的灭点是指该直线上无限远点的( )。 (A)正投影(B)基透视(C)投影(D)透视[参考答案:D]  分值:10得分: 分 系统自动批改于2020年9月18日 14点39分 园林制图
  • 设A、B为两事件,已知,若事件A,B相互独立,则P(A)=( )得分: 分 杨秋霞批改于2020年7月2日 0点51分 概率论与数理统计
  • 设前提: p® (q®r), p, q. 则"r⋀s"不是其有效结论。 A、正确 B、错误计算机应用基础
  • 24、In the American family the husband and wife usually share important decision-making. When the children are old enough, they take part as well. Foreigners are often surprised by the permissiveness (宽容) of American parents. Children are often allowed to do pretty much _ _ 21 _ _ they wish without strict control by their parents. Children are encouraged to be _ _ 22 _ _ at an early age. Some people believe that American parents carry this freedom too far. Others think that a strong parental image would not suit American values. Because Americans emphasize the importance of independence, young people are expected to break away from their families by the time they have _ _ 23 _ _ their late teens or early twenties. This pattern of independence often raises serious problems for the aging parents of a small family. The average American is expected to live _ _ 24 _ _ the age of 70. The job-retirement age is usually 65. The children have left home, married, and _ _ 25 _ _ their own households. Often the major problem of many elderly couples is not economic, but they feel useless and lonely with neither an occupation nor a close family ties.统考英语完型填空
  • 6. 逻辑文件名是在所有SQL语句中引用物理文件时所使用的名称。物理文件名包括存储文件的路径以及物理文件名本身。( ) 对 错数据库应用技术
  • 75、附件中“系统工具”一般不包含______。 A.磁盘清理程序 B.碎片整理程序 C.系统还原 D.重装计算机计算机统考