Contact us
Choose a category below so we can get back to you as quickly as possible.
因為1微米=10-6米,所以這種花粉的直徑大約是40×10-6米,即4×10-5米,1÷(4×10-5)=2.5×104(粒).答:2.5×104粒這種花粉首尾連接起來能達到1米.
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.