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【判断题】
1976 年后,美国数据加密标准(DES)的公布使密码学的研究公开,从而开创了现代密码 学的新纪元,是密码学发展史上的一次质的飞跃。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】_______ of danger in the street at night, she had to go home, with a friend ______ her.
A.
Warning; following
B.
Having warned; followed
C.
Having been warned; following
D.
Warned; followed
【简答题】浅层平板载荷试验确定建筑地基浅部软土的地基承载力,试验中采用的承压板直径最小不应小于()
【单选题】She had never been to the Great Wall before. Today she saw it _______ the first time. [ ]
A.
at
B.
for
C.
in
D.
by
【单选题】_____ of the danger in the street at night, she had to go home, with a friend _____ her.
A.
Warned; followed
B.
Warned; following
C.
Having warned; followed
D.
Having warned; following
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