采用新方法测量铁含量时得到8个数据,采用t检验法计算得到的t值是1.67,而选定显著性水平为0.05时查表得到的t值是2.31,采用新方法是否引起了系统误差()
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1 一纳米等于()m
A. 十的负五次方
B. 十的负七次方
C. 十的负九次方
D. 十的负十一次方
Which of the following abbreviations is used to implement the breakpoint function of gdb()
A. n
B. i
C. b
D. l
Which of the following paths holds all the device files of the system()
A. bin
B. dev
C. lib
D. root
When compiling a program with gcc, only the preprocessing phase is carried out, which of the following options()
A. -E
B. -S
C. -c
D. -o