【判断题】根据热力学第二定律,高质能能自发地转变为低质能,而低质能量不可能自发地转变为高质能量而引起其他的外界变化。
【简答题】If your mother wants to tell you something, she uses words. Birds cannot talk as we do. But some birds can make sounds to warn their young of er. They have their own way to make the young birds do...
【简答题】“姑苏城外寒山寺,夜半钟声到客船”.诗句中所描写的客船上的人听到了寒山寺的钟声,这钟声是由寺里的大钟被僧人撞击______产生的;客人能分辨出传来的是钟声,他是根据声音的______来判断的.
【简答题】If your mother wants to tell you something, she uses words. Birds cannot talk as we do. But some birds can make sounds to warn their young of er. The jackdaw is a kind of blackbirds that lives in ...
【判断题】豆类蔬菜播种前不宜浸种时间过长。 ( )
【单选题】Mary, ____________, but I can’t take part in your bir thday party tomorrow.
【判断题】发光细菌是一类非致病的革兰氏阴性微生物,它们在适当的条件下能发射出肉眼可见的蓝绿色光。