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  • — What should I do, doctor? — _____ healthy you should take more exercise.
  • 真果的果皮发育于
  • 要实现UO=UI1—UI2,应选用
  • 最常用的稳定静态工作点的放大电路是( )
  • 如果线圈的形状,匝数和流过它的电流都不变,只改变线圈中的媒介质则该线圈内( )
  • My grandfather lives in a little village. He lives _____ , but he doesn’t feel _____ .
  • Keep the dictionary _____ I can see it.
  • We often have three meals _____ day.
  • It’s very nice _____ you to get me two tickets _____ the World Cup.
  • This book is three times_____ that one.
  • My son is old enough to take care of _____ .
  • 白菜的花序为( )。
  • 常常有叶绿体,能进行光合作用的组织是( )。
  • 细胞内染色质的主要成分是( )。
  • Have you read _____ newspaper yet?
  • 装配图中其他视图选择时要( )。
  • 以下不属于剖视图种类的是( )。
  • 正垂线一定( )。
  • 机床导轨通常采用( )方法润滑。
  • 传动比最为准确的传动类型是( )传动。