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【单选题】
除了哪一条之外,其它都是DNA作为遗传物质的优点?A.
储存遗传信息量大
B.
双螺旋结构有利于复制, 转录，重组
C.
化学性质比RNA稳定
D.
DNA比RNA分子长
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反馈参考答案：
举一反三
【判断题】The flight atte n dants are helping passengers to put their baggage in the right place in case that the baggage falls down and hurt the passengers.
A.
正确
B.
错误
【单选题】TCP/IP是Internet事实上的国际标准,根据网络体系结构的层次关系,其中______使用 TCP协议,______使用IP协议。
A.
(A)应用层、网络层
B.
(B)传输层、物理层
C.
(C)传输层、网络层
D.
(D)链路层、物理层
【单选题】TCP/IP是Internet事实上的国际标准,根据网络体系结构的层次关系,其中______使用 TCP协议,网络层使用IP协议。
A.
应用层
B.
物理层
C.
传输层
D.
链路层
【单选题】TCP/IP是Internet事实上的国际标准，根据网络体系结构的层次关系，其中______使用 TCP协议，______使用IP协议。
A.
应用层、网络层
B.
运输层、物理层
C.
运输层、网络层
D.
链路层、物理层
【简答题】完形填空. It's a Sunday morning. Jack and his father 1 on a big bus. There are 2 people on it.Some of 3 come from America and some 4 England and Canada. They are all friends.They are going to the Summer P...
【简答题】All of the following underlined words and expressions are related to disaster. Read them closely and use them to complete the passage below. • ... passengers looked up at me with the nervous expressio...
【简答题】06 Part III Task 1 Notice of Baggage Inspection (检查) To protect you and your fellow passengers, the Transportation Security Administration (TSA) is required by law to inspect all checked baggage. As ...
【简答题】Thanksgiving Day Thanksgiving Day is celebrated on the 1 f ____ Thursday in 2 N ____. In 1620 the 3 M ____ (the ship) arrived in North America, bringing about 102 people who today are usually called 4...
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