D=5×10-5 可读为 D is equal to five times ten to the minus fifth(negative five) power;D is equal to five times ten to the power of minus five(negative five); D is equal to five times ten to the minus five(negative five);D is equal to five times ten minus five 或 D is equal to five ten minus five。前两个是完整的说法, 后面是不同程度的省略。