防火墙主要可以分为______、代理服务器和应用级网关等类型。
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59（）
A. How can I do that
B. Are you going today
C. Did you get it
Do you have that
E. Would you like my help
F. Yes，I know
G. NO，I don’t know
H. Can I sell my used books
35（）
A. anyone
B. neither one
C. everyone
D. someone
60（）
A. How can I do that
B. Are you going today
C. Did you get it
Do you have that
E. Would you like my help
F. Yes，I know
G. NO，I don’t know
H. Can I sell my used books
当数据库的存储结构改变时，可相应修改 【6】 ，从而保持模式不变。
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