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【简答题】
试比较DNA与RNA的组成成分、分子二级结构、细胞内分布和功能。
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皮皮学刷刷变学霸
举一反三
【单选题】We are convinced that we are on the ______ of an important discovery.
A.
threshold
B.
household
C.
thread
D.
entrance
【单选题】关于运动和力的关系，下列说法中正确的是 ( )
A.
如果物体在运动，那么它一定受到力的作用
B.
力是物体获得速度和位移的原因
C.
力只能改变物体运动速度的大小
D.
力是使物体产生加速度的原因
【单选题】The effects of almost universal employment were overwhelming in that ______.
A.
the household and village community disappeared
B.
men now traveled enormous distances to their places of work
C.
young and old people became superfluous components of society
D.
the work status of those not in paid employment suffered
【单选题】关于物体所受的重力和物体对支持面的压力的关系,下列说法中正确的是( )
A.
压力就是物体所受的重力
B.
压力一定等于物体所受的重力
C.
压力和重力不可能是同一个力
D.
压力和重力的方向都是竖直向下的
【单选题】The effects of almost universal employment were overwhelming in that_______．
A.
the household and village community disappeared completely
B.
men now travelled enormous distances to their places of work
C.
young and old people became superfluous components of society
D.
the work status of those not in paid employment suffered
【简答题】中国商代的尺,一尺有 多长?
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