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【单选题】
信息安全的完整性是指A.
信息不泄露给非授权的个人、实体，不供非授权使用
B.
授权用户可以根据需要随时访问所需信息
C.
数据和资源未被改变，真实可靠
D.
系统在规定的条件和时间内完成规定功能的概率
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【单选题】Even the peaceful use of nuclear power is potentially dangerous because of ______.
A.
long-term deadly pollution
B.
an imbalance of benefits
C.
losing its justification
D.
a change of morals
【单选题】The use of nuclear power is the subject of widespread ______.
A.
argument
B.
dispute
C.
controversy
D.
debate
【简答题】将下列段落翻译成中文 Proponents of nuclear energy argue that nuclear power is a sustainable energy source which reduces CO 2 emissions and can increase energy security if its use supplants the dependence on imp...
【单选题】调相信号uPM= 50cos(1.01´ 108t+ 0.2cos57.5 ´ 103t)mV，该信号的卡森带宽BWCR为（ ）。
A.
57.5 ´ 10 3 rad/s
B.
115 ´ 10 3 rad/s
C.
11.5 ´ 10 3 rad/s
D.
138 ´ 10 3 rad/s
【简答题】The author’s attitude towards the development of nuclear power is ________. A) negative B) neutral C) positive D) questioning
【单选题】听力原文： President George W. Bush insisted the Iraq war could still be won and dismissed mounting calls for a change in strategy as US lawmakers voted again for troop withdrawals. Bush struck a defiant t...
A.
Support.
B.
Objection.
C.
Neutrality.
D.
Unclear.
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