B.
70 ~ 100 μ m ,在光镜下可分辨 prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
D.
7 ~ 10nm ,在光镜下可分辨 prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
E.
E . 7- 10nm ,在光镜下不可分辨 prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>