题目内容

关于等距抽样，下列说法不正确的是()。

A. 质量差异小的时间段扩大抽样间隔
B. 质量差异大的时间段减缩抽样间隔
C. 经常在对生产过程的监控抽样时应用
D. 经常在总体发生周期性变化的场合采用此方法

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The use of helium for deep-sea diving ______.

A. helped to overcome the physical discomforts the divers suffered when nitrogen was used
B. was found by Dr. J. Hildebrand
C. is now still generally acknowledged as standard practice for deep-sea diving
D. may be thought to contain all the information stated in A, B, and C

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