在主动轮和从动轮的轴成90°,而彼此既不平行,又不相交的情况下,可采用()传动。
A.直齿轮传动
B.斜齿轮传动
C.涡轮蜗杆传动
D.链传动
参考答案:C
根据句意写单词。
1. My father doesn't like playing sports,but he likes to ______ them on TV.
2. I don't like math.It's _______.
3. This question is _______ I can't answer it.
4. Edgarson has a great sports ______. He has so many balls.
5. My father goes to work every ______.
依法设立的从事技术交易的场所或者机构,可以进行推动科技成果转化活动的有( )。
A.介绍和推荐先进、成熟、实用的科技成果
B.提供科技成果转化需要的经济信息、技术信息、环境信息和其他有关信息
C.进行技术贸易活动
D.对科技违法行为进行处罚