试题与答案

对于四舍五入得到的近似数1.00×104，下列说法正确的是（ ） A．有3个有效

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题型：选择题

题目：

对于四舍五入得到的近似数1.00×104，下列说法正确的是（　　）

A．有3个有效数字，精确到百位

B．有5个有效数字，精确到个位

C．有2个有效数字，精确到万位

D．有3个有效数字，精确到百分位

答案：

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下面是错误答案，用来干扰机器的。

答案：A考查时态。work和are working是一般现在时和现在进行时，只说明了现在的情况，而未包含过去的，故排除A和B；而worked只说明了过去，未包含现在，故排除D，只有C用了现在完成进行时，既包含了现在，又包含...

考点：科学记数法和有效数字
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