皮皮学，免费搜题
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【单选题】
第一心音标志什么的开始A.
心房舒张
B.
心室收缩
C.
心房收缩
D.
心室舒张
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【简答题】n.1商(数),系数 2份额,应分得的部分
【判断题】Today, we know that the "transforming principle" Griffith observed was the DNA of the III-S strain bacteria. While DNA had been known to biologists since 1969, most assumed at the time that proteins c...
A.
正确
B.
错误
【简答题】部分;份额 n.
【简答题】The reality show ( 真人秀 )is a kind of television program. Usually a reality show has many series( 集 ),And it can be be on TV for many years. The reality show is quite different from other kinds of TV s...
【简答题】部分;份额 比例;倍数关系 n.
【单选题】有关Waston和Crick提出的DNA双螺旋结构模型,说法错误的是
A.
组成双螺旋的两条链反向平行
B.
碱基对位于双螺旋的内侧
C.
维系双螺旋结构的作用力主要是碱基堆积力
D.
DNA双链是左手螺旋
【简答题】阅读理解 A Before the 1830s,most newspapers were sold through annual subscriptions in America, usually $8 to $10 a year. Today $8 or $10 seems a small amount of money, but at that time these amounts were ...
【简答题】当恢复现场时不允许被打扰，CPU应处于（）状态。
【简答题】按照Waston和Crick的DNA双螺旋结构模型,连接两条反向平行的DNA链的碱基对位于双螺旋的 部,并垂直于 骨架,碱基对之间通过 相互垛叠在一起,对双螺旋的稳定起一定作用。
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