【多选题】就误差的性质而言,误差可以分为哪几类?( )
【简答题】按误差来源划分误差可以分为几类()。 A仪器误差 B环境误差 C理论误差与方法误差 D人员误差
【简答题】看到学生人数不断减少,校长心里很难受。 (pain)
【判断题】对比分析的步骤一般是指:选择、对比、统计、预测。
【单选题】The usage of E-mails has made it possible for the writer to()
A.
spend less time working
B.
have more free time with his child
C.
work at home on weekends