A:What are you going to visit the Summer Palace?
B:Where are you going to visit the Summer Palace?
C:When are you going to visit the Summer Palace?
下列关于双链DNA的叙述错误的是( )
- What are these? ( )
- They are _______.
如图所示,三个装满水的相同的玻璃缸,其中甲图只有水,乙图水中漂浮着一只小鸭子,丙图水中漂浮着一只大鸭子,则三个玻璃缸底部受到水的压强P甲P乙P丙的关系是____。
下列组织中,具有接受刺激,产生和传导兴奋的是( )