滚动螺旋传动不具有自锁性。( )
参考答案：对
根据句意和汉语提示完成单词。
1. How many (书本) are there in your schoolbag?
2. Can you (骑) horse?
3. My brother is a (医生) in a hospital.
4. My hobby is playing (篮球).
5. Shally (喜欢) playing the piano.
基率信息
