【判断题】联合操作分析的基本原则是人和机器的动作分阶段进行为最佳。
【单选题】The youth continued to gawk at that pretty girl and did not answer.
【单选题】Strange how the habits of his youth clung to him still! (Para. 1)
A.
It was strange that he still wanted to keep the habits of his early days.
B.
It was strange how up to that moment he had continued doing things the way he had always done them from boyhood.
C.
The habits of his early days are so strange that he still wanted to keep them.
【简答题】如果m和n是互质数,那么它们的最大公因数是( ),最小公倍数是( )