按照TCSEC的等级划分,强制安全保护类的划分为()
A.标识安全保护
B.结构化保护
C.安全域
D.物理保护
E.人事保护
参考答案:A, B, C
We were told not to touch the equipment in the laboratory unless ________.
A.allowed to do
B.allowing to do
C.allowed to
D.allowing to
按免疫球蛋白重链抗原性的不同可将其分为几类
A.五类B.四类C.三类D.二类E.二型