If we _______ adequate preparations, the

搜题请搜索小程序“爱下问搜题”

问题选择题

If we _______ adequate preparations, the conference wouldn't have been so successful.[ ]

A. haven't made

B. wouldn't make

C. didn't make

D. hadn't made

答案

答案：D

填空题

一辆坦克的质量为20t，它有两条履带，每条履带与水平地面的接触面积为2m²，该坦克对水平地面的压力为____________N，压强为_______________Pa．宽大的履带是为了___________对地面的压强。（填“增大”或“减少”）

单项选择题

下列不属于对称加密算法的是（）

A.RC4

B.3DES

C.AES

D.ECC