一根头发丝的直径约8.2µm,合____m.正常平静时的一次心跳所需的时间大约是0.8____ .如图所示,如果尺子的单位是cm,木板的长度是____ cm.
读《画杨桃》,根据课文内容回答问题。
2.995精确到百分位是3
—I hope that what we have said will not fall on deaf ears.
— Don’t worry. It’s good for their study. They will follow it.