图3.
SIS海绵环境扫描电镜观察
Scanning electron microscope results of SIS sponge
A, ×300; B, ×500.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.