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【简答题】
秩和检验法是用来检验 A 、 B 两组数据是否存在显著性差异的一种方法。假设 A 组数据无系统误差,如果 A 与 B 有显著性差异,则认为 B 系统误差;如果 A 与 B 无显著性差异,则认为 B 系统误差。
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举一反三
【单选题】He never regretted the anxious hours he had had ______ for the missing papers．A．searchB．searching
A.
26．He never regretted the anxious hours he had had ______ for the missing papers． A．search
B.
searching
C.
searched
D.
to search
【单选题】He replied quickly, but after he considered the problem more carefully, he regretted having made such a hasty decision.
A.
careful
B.
hard
C.
good
D.
quick
【判断题】He regretted having left the community because of starvation and terrible weather.
A.
正确
B.
错误
【简答题】见教材P.205练习题5
【单选题】He regretted ___the earlier flight.
A.
he would not take
B.
not having taken
C.
not to have taken
D.
not to take
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