【简答题】任务型阅读。阅读短文,并根据短文内容回答问题。 Why is more and more land becoming deserts? Scientists are trying to make the deserts into good land again. They want to bring water to the deserts, so people can live and grow...
【多选题】共同存在于 RNA 和 DNA 中的碱基是( )
【多选题】下列属于我国法律规定的免责条件或情况的有
【简答题】填土压实的方法主要有( )、( )、( )。