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【简答题】
逆转录酶病毒的逆转录酶可以催化RNA指导的DNA合成，______以及DNA指导的DNA合成3个不同的反应。
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反馈参考答案：
举一反三
【多选题】如下图所示是数字签名和身份验证的实现过程,下列说法正确的有:
A.
信息摘要就是数字签名
B.
信息摘要用A的公钥加密就是A的数字签名
C.
信息摘要用A的私钥加密就是A的数字签名
D.
单向函数是不可逆的
【单选题】A key reason the news media exists with special privileges is to be our watchdogs. Reporters' charge is to alert us when something is wrong, when human or natural disasters are about to threaten our w...
A.
forecasting the natural disasters, such as earthquake, storm, and so on.
B.
alerting us to the possibility of some world-scale economic crisis.
C.
reporting on the latest development of Indonesian Tsunami.
D.
disclosing corporations' illegal behaviors under government legislation.
【简答题】立容____,是说站姿可以表现他的德行,站立时不倚不靠,挺身而立,不仅精神饱满,而且也是对他人的尊重。
【单选题】— Do you think the weather will be all right this golden week? — No, _____ we're lucky, it is reported that there will be sandstorms anyway. [ ]
A.
if
B.
though
C.
unless
D.
as
【简答题】(2017 北京, 31)The little problems ________ we meet in our daily lives may be inspirations for great inventions. 2.(2016 北京, 22)I live next door to a couple ________ children often make a lot of noise. ...
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