Various opinions of definition before and after 1999, number of digits of significant figures and digit number s of uncertain figure s viz.

总结了1999年以前和以后有效数字的定义、有效数字位数、有效数中包含的不确定数字(即文献上称：“存(可)疑数字、或估计数字”)的位数等不同的观点。

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Various opinions of definition before and after 1999, number of digits of significant figures and digit number s of uncertain figure s viz.

简述有效数字的概念、意义及其运算规则，列举实例说明有效数字在制浆造纸物理性能检测中的意义和作用。

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The design in Figure 2 overcomes the problems of excessive power consumption, uncertain switching, and LED aging.

图2的设计克服了能耗过大、不确定开关和LED老化的问题。

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Moreover, Mr. Scott adds, it is easier to plan to make a retirement nest egg last until these payments begin than it is to figure out how to stretch it over an uncertain lifetime.

WSJ: Should You Buy 'Longevity' Insurance?