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【单选题】
核酸的基本组成单位A.
戊糖
B.
核苷酸
C.
磷酸
D.
碱基
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】对于目前船用的多普勒计程仪,下面说法中最恰当的是_____。315
A.
测量船舶对地速度
B.
测量船舶对水速度
C.
浅水测量船对地速度，深水可测量船对水速度
D.
深水测量船对地速度，浅水测量船对水速度
【单选题】What eminent appointment did John Donne receive in 1621?
A.
Donne was appointed Vicar of St. Dunstan’s-in-the-West in 1621, the eminent position he held until his death.
B.
Donne was appointed Bishop of Saint Paul’s Cathedral in 1621, the eminent position he held until his death.
C.
Donne was appointed Royal Chaplain of Saint Paul’s Cathedral in 1621, the eminent position he held until his death.
D.
Donne was appointed Dean of Saint Paul’s Cathedral in 1621, the eminent position he held until his death.
【简答题】The poems of John Donne belong to two categories; the ______, and the later
【简答题】阅读理解。 Jack is ten years old this year. He is in Grade Three. He doesn't work hard at school. His teacher doesn't like him. But Jack thinks he is the cleverest student in his class. And he thinks his m...
【单选题】对于目前船用多普勒计程仪，下面说法中最恰当的是_______
A.
测量船舶对地速度
B.
浅水测量船对地速度，深水可测量船对水速度
C.
测量船舶对水速度
D.
深水测量船对地速度，浅水测量船对水速度
【简答题】阅读理解。 Jack is six years old. He has no sisters. But he has a brother. His brother's name is Mike. Jack likes eating apples, oranges and bananas. Sometimes he eats some of his brother's apples. And his...
【单选题】电子数据更加容易受到例如毁坏、欺诈、错误以及滥用等安全威胁，这是因为信息系统将数据集中存放在计算机文件中，而且这些文件_________
A.
常常跟企业遗留的系统绑定在一起，导致很难访问，在出错的时候也很难纠正。
B.
因为在创建的时候保障安全的技术尚不存在，所以是不安全的。
C.
有可能被大量的组织以外的人和群体访问。
D.
常常可以在互联网上获得。
【简答题】生病的;不健康的
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