...weighs 12 grams and contains 1-5 × 109 pollen grains...
1. A pollen sample weighs 12 grams and contains 1-5 × 109 pollen grains.Calculate the weight of one pollen grain in grams.Give your answer in scientific notation. 相关知识点: 试题来源: 解析 1. 12÷1.5*10^9=8*10^(-5) grams 反馈 收藏